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FN SCAR

The FN SCAR (Special Operations Forces Combat Assault Rifle) is a family of gas-operated, modular assault rifles developed and manufactured by the Belgian arms company FN Herstal to meet the requirements of the United States Special Operations Command (USSOCOM). Introduced in the mid-2000s, the SCAR series emphasizes adaptability through interchangeable barrels, calibers, and configurations, primarily featuring the lighter SCAR-L variant chambered in 5.56×45mm NATO and the heavier SCAR-H in 7.62×51mm NATO, both with short-stroke gas piston systems for reliability in adverse conditions. The design incorporates ambidextrous controls, full-length Picatinny rails for optics and accessories, and options for selective fire or semi-automatic modes, making it suitable for special operations, close-quarters battle, and designated marksman roles. The SCAR program originated from a USSOCOM solicitation seeking a versatile replacement for the aging and used by U.S. , with selected as the sole contractor in November 2004 after rigorous testing. Initial prototypes focused on to allow quick caliber swaps and barrel changes—such as 10-inch or 14.5-inch options for the SCAR-L MK2—while maintaining a weight of approximately 7.25 pounds unloaded for the standard configuration. Production began in 2007, with the rifles first deployed to U.S. troops, including the , in 2009; the system achieved full-rate production approval from USSOCOM in 2010. Beyond the core SCAR-L and SCAR-H models, the family includes subcompact variants like the FN SCAR-SC in 5.56×45mm or 7.62×35mm (.300 Blackout) for , as well as precision rifles such as the SCAR-H PR with a 20-inch heavy barrel for enhanced accuracy at extended ranges. Adopted primarily by USSOCOM for its Mk 16 (SCAR-L) and Mk 17 (SCAR-H) designations, the has seen use by elite units in conflicts like and , though procurement of the 5.56mm version was scaled back in favor of the more versatile 7.62mm model due to performance evaluations. Internationally, it has been selected by forces including the Belgian Special Forces Group and units, underscoring its global reputation for durability and customization. In 2025, discontinued the commercial civilian versions of the in the United States, citing market shifts, while production continues for ongoing contracts.

History and Development

Origins and Requirements

In the early 2000s, during the initial phases of the Global War on Terror in and , U.S. Command (SOCOM) identified significant reliability challenges with the existing and systems. These weapons, relying on a gas system, were prone to fouling from sand, dust, and mud, leading to frequent malfunctions and increased maintenance demands in harsh operational environments. This dissatisfaction stemmed from combat experiences where the rifles' performance fell short of the adaptability and durability needed for special operations forces (SOF) engaging in diverse missions. To address these shortcomings, initiated the Forces Combat () program in as part of its broader effort to modernize SOF weaponry. The program was formalized with the approval of the Joint Operational Requirements Document (JORD) in September 2003, establishing it as an official "Program of Record." The initiative sought to create a versatile family of modular rifles capable of replacing multiple existing systems, including the M4A1 carbine, Mk 18 close-quarters weapon, and various battle rifles, while providing greater flexibility across combat roles from to tasks. Central to the JORD were stringent performance criteria emphasizing reliability and adaptability. The rifles were required to feature interchangeable barrels for seamless caliber conversion between 5.56x45mm for lighter assault roles and 7.62x51mm for heavier engagements, along with provisions for additional calibers as needed. with suppressors was mandated to minimize and during operations, while ambidextrous controls ensured usability for all operators. A quick-change barrel system was specified to enable rapid reconfiguration for sustained fire without tools, enhancing mission readiness in dynamic environments. These requirements prioritized a short-stroke gas mechanism to reduce carbon buildup and improve overall durability over the designs of legacy rifles. In January 2004, issued a request for proposals to industry, culminating in the selection of Belgian manufacturer (through its U.S. subsidiary, FN America) as the prime contractor on November 5, 2004, following a rigorous competition involving prototype evaluations. This award initiated the development phase, with FN tasked to deliver prototypes meeting the JORD's exacting standards for modularity and performance.

Selection Process

In early 2004, the (SOCOM) initiated a competitive selection process for the Forces Combat () program through a worldwide solicitation issued in January, seeking a modular family of rifles to replace existing weapons like the M4A1 . Nine vendors submitted 12 prototype designs, including entries from , , and Robinson Armament, which were evaluated based on initial performance criteria such as modularity, reliability, and adaptability to multiple calibers. By July 2004, 's submission was downselected as the sole winner after unanimously passing all requirements set by a board of senior SOF operators, leading to a development contract awarded in November 2004 valued at approximately $634,000 for prototypes in 5.56mm (-L/Mk 16) and 7.62mm (-H/Mk 17) configurations, featuring a short-stroke gas operating system designed to minimize fouling and improve reliability over systems. From August 2005 to January 2006, conducted developmental testing in collaboration with at U.S. Army facilities, assessing the prototypes' accuracy, endurance, reliability, and under extreme environmental conditions, including dust, sand, and temperature variations. This phase involved firing tens of thousands of rounds per rifle to simulate combat stress, with additional operator feedback gathered during four Early User Assessments by elite units such as Army Rangers and Navy SEALs in diverse settings like urban areas, operations, jungles, and winter mountains. Subsequent from May 2006 to June 2007 further refined the design, confirming the piston's effectiveness in reducing carbon buildup and enhancing sustained performance. The rigorous evaluation culminated in the official selection of the FN SCAR in October 2007, with announcing approval for low-rate initial production following successful initial operational testing and evaluation. Initial contracts focused on delivering the Mk 16 and Mk 17 variants to equip forces, marking the first new family adopted by since the M16/M4 series over four decades earlier.

Initial Procurement Challenges

Following the 2007 selection of the FN SCAR by the U.S. Special Operations Command (), initial procurement efforts encountered significant hurdles as the U.S. Army considered broader adoption for conventional infantry units. In 2009, the Army initiated evaluations of the SCAR for potential widespread use, fielding an initial batch of approximately 600 rifles to the to assess performance in combat environments. However, these trials highlighted the rifle's high unit cost—estimated at over $2,200 per Mk 16 variant—compared to the M4 carbine's average of $700, prompting concerns about fiscal sustainability for large-scale procurement. Ultimately, the Army opted to restrict the SCAR to SOCOM-exclusive use, citing the ongoing upgrades to the M4A1 as sufficient for meeting infantry needs without introducing a new platform. By 2010, these challenges culminated in a major program restructuring, with cancelling full-rate production of the Mk 16 (SCAR-L) after acquiring fewer than 1,000 units, primarily for continued testing and evaluation. Funds were redirected to procure additional Mk 17 (SCAR-H) rifles, with approvals for over 3,000 units tailored for and roles to address specific capability gaps in 7.62mm support. The decision stemmed from the Mk 16's marginal improvements over the upgraded M4A1 in reliability and , coupled with logistical considerations tied to the existing 5.56mm ammunition , which favored maintaining the M4 ecosystem for cost efficiency and simplicity. Sustainment further complicated early adoption, leading to a transition toward integration with the Special Operations Forces Global Combat Support System (GCSS-SOF) for streamlined and tracking. This shift aimed to mitigate the SCAR's higher lifecycle costs by leveraging automated , though it underscored the platform's niche role within rather than broader Army inventories.

Design and Features

Operating System and Calibers

The FN SCAR employs a short-stroke gas piston operating system, where propellant gases are tapped from the barrel to drive a piston that imparts a short impulse to the bolt carrier group, enabling reliable cycling without introducing hot gases directly into the receiver. This design contrasts with systems, such as those in AR-15 platforms, by minimizing carbon fouling and heat buildup in the action, thereby enhancing reliability in adverse conditions like dust or prolonged firing. The system includes an adjustable gas regulator positioned near the front sight base, allowing operators to fine-tune gas flow for suppressed or unsuppressed configurations, which maintains consistent performance and reduces over-gassing during low-pressure scenarios. The platform supports two primary s tailored to distinct tactical roles: the -L variant chambers 5.56x45mm ammunition, offering lighter recoil, higher magazine capacity, and suitability for close-to-medium engagements, while the -H uses 7.62x51mm rounds for superior penetration, stopping power, and extended range against armored or distant targets. The permits caliber interchanges between these configurations with minimal tools, adapting the rifle to mission-specific needs. Barrels are cold hammer-forged and chrome-lined for enhanced durability and accuracy retention, with lengths varying by variant: (CQC) models feature 10- to 16-inch barrels for maneuverability in confined spaces, while standard configurations use 14- to 20-inch barrels to optimize velocity and . These barrels are rated for a exceeding 15,000 to 20,000 rounds, depending on firing conditions and maintenance. In terms of performance, the SCAR-L achieves a cyclic rate of fire of approximately 625 rounds per minute, with an effective point-target range of 600 meters using 5.56x45mm ammunition, whereas the SCAR-H operates at around 600 rounds per minute and extends effective range to 700 meters with 7.62x51mm loads, balancing controllability and lethality.

Modularity and Ergonomics

The FN SCAR's design emphasizes modularity through its interchangeable components, enabling rapid reconfiguration for diverse operational needs without specialized tools. The rifle features a quick-change barrel system that allows field swaps in under two minutes, facilitating adjustments for different barrel lengths or even caliber conversions by replacing the bolt carrier group. This capability supports seamless transitions between close-quarters combat and longer-range engagements, enhancing adaptability in dynamic environments. Ergonomics are optimized for user comfort and , incorporating ambidextrous controls including the magazine release, bolt catch, and safety selector to accommodate both left- and right-handed operators. The folding, adjustable includes a riser and multiple positions for adjustment, allowing to individual body types and gear configurations such as helmets or . The monolithic upper integrates MIL-STD-1913 Picatinny rails along the handguard, top, and , providing extensive mounting options for mission-specific attachments while maintaining a stable platform. Constructed primarily from lightweight polymers in the lower and , the achieves reduced overall weight compared to traditional all-metal , with the standard SCAR-L variant weighing 3.3 unloaded. Its adjustable length ranges from 54 (stock folded) to 78.8 (stock extended), with the stock retracted at 72.4 , balancing compactness for maneuverability with stability for precision shooting. These elements collectively minimize user fatigue and improve handling across extended missions.

Accessories and Sighting Systems

The FN SCAR is equipped with standard flip-up mechanical , consisting of an adjustable folding front sight and a folding/removable rear sight designed for backup use when primary are not employed. These sights are positioned to co-witness with mounted on the rifle's rail system, ensuring quick transitions between sighting methods. The SCAR's monolithic upper receiver incorporates a full-length MIL-STD-1913 at the 12 o'clock position, along with additional rails at the 3, 6, 9, and 12 o'clock positions on the handguard, enabling the attachment of a wide range of sighting systems. Representative optics compatible with the platform include the ACOG for providing 4x magnification on SCAR-L variants in close-to-medium range engagements, and the Elcan SpecterDR dual-role sight for day/night operations on SCAR-H models, both leveraging the rail for secure mounting. Suppressor integration on the SCAR platform is facilitated through the muzzle device and rail system, with the (KAC) Quick Detach Coupler (QDC) system commonly used on SCAR-H variants to reduce sound and flash signatures while preserving the rifle's inherent accuracy. The KAC 7.62 QDC suppressor maintains sub-MOA performance in compatible hosts, aligning with the SCAR-H's design for suppressed operations in applications. Additional accessories supported by the SCAR's rail configuration include vertical foregrips for improved handling, Harris Engineering bipods for stability in prone positions, and the AN/PEQ-15 laser aimer for low-light target designation, all standard in military modular setups.

Military Variants

Close Quarters and Standard Assault (SCAR-L/Mk 16)

The SCAR-L, also designated as the Mk 16 by the United States Special Operations Command (SOCOM), serves as the 5.56×45mm NATO light assault rifle variant within the FN SCAR family, tailored for standard assault and close quarters combat (CQC) missions. Chambered for the standard NATO intermediate cartridge, it employs a gas-operated short-stroke piston mechanism that drives a rotating bolt, providing enhanced reliability over direct impingement systems like that of the M4 carbine, especially during prolonged suppressed fire where carbon fouling is reduced in the receiver. This design contributes to consistent performance in adverse conditions, such as dust or high-round-count operations typical of special operations entry teams. The standard Mk 16 configuration features a 14.5-inch (368 mm) barrel, balancing maneuverability with effective engagement ranges of 300 to 500 meters for point targets, making it suitable for squad-level assaults and mid-range . It is fully compatible with 30-round STANAG magazines, facilitating seamless integration with existing 5.56mm and allowing quick caliber commonality in mixed-unit deployments. Weighing approximately 3.5 without a magazine, the includes a foldable and adjustable buttstock that shortens the overall length to 655 mm when folded, aiding transport and vehicle operations. For closer engagements, the Mk 16 CQC variant shortens the barrel to 10 inches (254 mm), prioritizing compactness for room clearing and confined urban environments, with an of around 400 meters. This configuration reduces the folded length to 540 mm and weighs about 3.3 kg empty, enhancing handling in dynamic scenarios while retaining the same 30-round magazine capacity and cyclic rate of 550-650 rounds per minute. The shorter barrel maintains ballistic performance adequate for short-range dominance, though it trades some for reduced and improved during rapid fire. Accuracy testing demonstrates the SCAR-L's precision potential, achieving groups of approximately 1.5-2 with M855A1 enhanced performance rounds from the 14.5-inch barrel, sufficient for engaging man-sized targets at its optimized ranges without requiring specialized optics. SOCOM initially procured around 850 Mk 16 rifles in limited production for specialized entry teams, valuing the platform's and piston-driven reliability over the M4, though further acquisitions were curtailed in due to cost-benefit assessments favoring existing inventories. Key advantages over the M4 include the non-carbon-fouling for sustained suppressed operations and a reciprocating charging handle that supports aggressive reloads, though the overall system emphasizes durability in contexts rather than pinpoint marksmanship.

Battle Rifle and Designated Marksman (SCAR-H/Mk 17)

The Mk 17, also known as the SCAR-H, is the 7.62×51mm NATO battle rifle variant of the FN SCAR family, developed specifically for U.S. Special Operations Command (SOCOM) requirements in precision fire support and squad-level engagements. The standard configuration features a 16-inch barrel, weighs 3.58 kg empty, and uses 20-round detachable magazines. Its short-stroke gas piston operating system ensures reliability in adverse conditions, with an effective range of up to 700 meters for point targets when using standard 7.62×51mm ammunition. When loaded with M118 Long Range (M118LR) match-grade rounds, the rifle extends its practical engagement distance to approximately 800 meters, providing enhanced penetration and terminal ballistics for intermediate-range combat. For designated marksman roles, the Mk 17 incorporates configurable barrel lengths of 13 to 20 inches, allowing adaptation between close-quarters and long-range precision tasks. The long-barrel (20-inch) variant, often equipped with a bipod as standard, serves as a , delivering sub-minute of angle (sub-MOA) accuracy with match ammunition for targeted suppression and overwatch. This setup contrasts with the standard assault role by prioritizing stability and optics integration, enabling effective fire beyond 900 meters in point-target scenarios. Since initial fielding in 2010, has procured over 5,000 Mk 17 units to replace legacy systems like the Enhanced (EBR). These rifles emphasize modularity, allowing rapid barrel swaps and accessory mounting that outperform the M14 EBR in adaptability for diverse missions, including urban operations and extended patrols. In service, the Mk 17 provides versatile precision fire support, balancing the 7.62mm cartridge's stopping power with the platform's lightweight design for special operations forces.

Specialized Configurations

The FN SCAR family includes several specialized military configurations designed to extend its versatility for unique operational roles, such as enhanced support and precision engagements beyond the standard assault and variants. These adaptations leverage the platform's modular rail system and gas piston operation while incorporating dedicated components for specific missions in forces (SOF). One key adaptation is the Enhanced Grenade Launcher Module (EGLM), designated as the FN MK 13, which integrates a 40mm low-velocity underbarrel directly onto the SCAR's Picatinny rails for seamless attachment to either the SCAR-L or SCAR-H. This module fires NATO-standard 40x46mm grenades, including high-explosive, smoke, and illumination types, enabling operators to engage targets at ranges up to 400 meters without detaching the primary rifle. The EGLM was fielded alongside initial SCAR procurements starting in April 2009, providing SOF units with rapid capabilities during close-quarters and patrol operations. The FN Heavy Assault Modular Rifle (HAMR), a 5.56x45mm variant derived from the SCAR-L platform, represents an experimental configuration tested by the U.S. Marine Corps as part of the Infantry Automatic Rifle (IAR) program starting in 2008, with evaluations concluding around . Featuring a belt-fed mechanism with options for 100-round soft packs or quad-stack magazines, the HAMR incorporated a heat-adaptive system allowing switching between closed-bolt semi-automatic for precision and open-bolt full-automatic for sustained fire, aiming to reduce overheating during prolonged engagements. Despite demonstrating reliability in endurance tests exceeding 60,000 rounds, the HAMR was not adopted due to competition from lighter alternatives like the HK M27 and evolving program priorities. For extended-range precision roles, the FN SCAR-H Precision Rifle (PR) variant equips a 20-inch heavy free-floating barrel optimized for 7.62x51mm NATO accuracy out to 800 meters, surpassing the standard SCAR-H's capabilities in designated marksman applications. It includes an adjustable side-folding stock with multiple positions for length of pull and cheek height, along with a two-stage match-grade trigger to enhance stability and follow-up shots in prone or supported positions. Primarily issued to special units within U.S. SOF and international operators like the French Army, the SCAR-H PR remains limited in distribution to elite sniper and overwatch teams. The , designated from the SCAR-H platform, is a semi-automatic chambered in 7.62x51mm with a 20-inch barrel, designed for squad-level and engagements up to 1,000 meters using match-grade ammunition. Featuring a fixed stock, adjustable cheek riser, and enhanced rail system for , the Mk 20 provides operators with a lightweight (approximately 4.5 kg empty) alternative to bolt-action systems, emphasizing modularity and rapid deployment in . Adopted in limited numbers since 2011, it supports and roles. Additional SOF-specific modifications include suppressed configurations of the SCAR-L, which integrate quick-detach suppressors compatible with 5.56x45mm ammunition to minimize and flash during covert operations. These setups, detailed in official operator manuals, limit continuous automatic fire to 90 rounds to prevent suppressor overheating while maintaining the rifle's modular rail for and lights. In the , SCAR platforms have undergone 6.5 Creedmoor caliber conversions through interchangeable barrel assemblies, tested by U.S. Navy SOF for improved long-range ballistics and reduced weight in roles, reflecting broader adoption of the cartridge across .

Civilian and Other Variants

Semi-Automatic Civilian Models

The FN semi-automatic models were developed as non-military variants of the combat-proven platform, adapted for the U.S. market to comply with federal regulations prohibiting full-automatic fire. These rifles and pistols maintain the , short-stroke gas piston operation, and high reliability of their military counterparts while featuring semi-automatic actions and compatibility with standard AR-15 pattern magazines. Introduced to capitalize on the rifle's reputation among enthusiasts, the line emphasized versatility for recreational shooting, home defense, and competitive use. The SCAR 16S, launched in early 2009, serves as the foundational civilian model chambered in . It features a 16-inch cold hammer-forged, chrome-lined barrel for balanced handling and velocity, with an unloaded weight of approximately 7.25 pounds that contributes to its maneuverability. The rifle accepts 30-round PMAG magazines and includes a monolithic upper receiver with full-length for mounting optics, lights, and other accessories, alongside fully ambidextrous controls including the safety selector, magazine release, and bolt catch. Priced with an MSRP starting around $3,200, the SCAR 16S quickly gained popularity for its robust construction and smooth operation, though production was limited to meet demand without oversupply. Building on the 16S platform, the 17S was introduced as a larger-caliber option in 7.62x51mm , also with a 16.25-inch barrel to optimize for longer-range performance and greater . Weighing about 8 pounds unloaded, it incorporates an adjustable gas regulator with three positions to accommodate suppressed fire, loads, or standard , enhancing reliability across varied conditions. In 2023, FN upgraded the model to the SCAR 17S NRCH variant, introducing non-reciprocating charging handles that remain static during cycling to reduce interference with and improve handling in awkward positions; these dual, swappable handles further emphasize . Like its sibling, it features extensive coverage and ambidextrous controls, with an MSRP of $4,239 for the NRCH edition, positioning it as a premium for civilian applications. The SCAR 20S, introduced in 2019, is a semi-automatic precision rifle variant chambered in 7.62x51mm , featuring a 20-inch cold hammer-forged, chrome-lined heavy barrel for enhanced long-range accuracy, an adjustable stock, and a Geissele high-performance . It weighs approximately 10.25 pounds unloaded and includes a design with full Picatinny rails and ambidextrous controls, making it suitable for precision and . With an MSRP around $3,999, it was popular among long-range enthusiasts until its discontinuation in October 2025. The most recent addition, the SCAR 15P, debuted in 2023 as a compact variant to address demand for short-barreled configurations suitable for brace-equipped setups under ATF guidelines. Chambered initially in 5.56x45mm with a 7.5-inch barrel, it weighs around 5.65 pounds unloaded and maintains the series' gas piston system, full rail system, and ambidextrous controls for easy customization. In October 2024, FN expanded the lineup with a .300 Blackout option, optimized with specific gas settings for and supersonic loads to support suppressed operation. Designed for brace compatibility (subject to NFA ), the 15P has an MSRP of $3,699 and represents the smallest footprint yet. In October 2025, FN America announced the discontinuation of production for the commercial 16S, 17S, and models due to shifting market demands, while the 15P continues as the sole active variant. This decision followed years of limited civilian output, estimated in the low thousands of units across the series, reflecting the rifles' niche appeal among high-end collectors and shooters. The move underscores the platform's evolution from military staple to specialized offering, with existing models remaining available through secondary markets.

Recent Accessory Enhancements

In 2023, FN America introduced conversion kits featuring dual non-reciprocating charging handles (NRCH) for the SCAR 17S, allowing users to upgrade existing models for improved handling, particularly when mounted with , as the handles do not reciprocate during firing and can be swapped for ambidextrous use; these became standard on new production rifles thereafter. Building on the platform's inherent modularity, 2024 saw the release of the SCAR 15P chambered in .300 Blackout, optimized for and suppressed operation in close-quarters scenarios, providing a compact personal defense option with the SCAR's short-stroke gas piston reliability. That same year, FN expanded long-range capabilities for the SCAR 17S with official 6.5 Creedmoor barrel assemblies in 16-inch and 20-inch lengths, enabling conversion via user-replaceable components to leverage the round's superior for extended engagements while maintaining the rifle's accuracy and durability. Complementing these updates, the SCAR-SC Rear Stock was launched in 2024 as a fully collapsible, three-position telescoping compatible across the SCAR lineup, including variants like the 15P, to enhance stability and cheek weld in configurations without adding significant bulk. In October 2025, FN America announced the discontinuation of the 16S, 17S, and 20S civilian production models, citing market shifts toward AR-platform alternatives, though military variants continue uninterrupted and parts support for existing civilian rifles will be provided.

Adoption and Operational Use

United States Special Operations

The FN SCAR was integrated into United States Special Operations Command (SOCOM) units as a modular rifle system designed to enhance operational flexibility for elite forces. Primary users include the Navy SEALs, who adopted the Mk 17 variant for its reliability in diverse environments; the 75th Ranger Regiment, which received initial fielding in April 2009; and Marine Forces Special Operations Command (MARSOC), where it supports critical skills operators in close-quarters and marksman roles. Training for the has been incorporated into pipelines since its initial deployment in 2009, with emphasis on the rifle's quick-caliber swap capability to allow operators to adapt between 5.56mm and 7.62mm configurations during missions. This reduces logistical burdens and supports rapid reconfiguration in the field, aligning with requirements for versatility across assault, , and tasks. Sustainment is handled through contracts with , focusing on spare parts, , and upgrades to ensure long-term reliability, which has contributed to lower life-cycle costs compared to legacy systems. As of 2025, military production of the SCAR continues for needs, despite FN America's discontinuation of all civilian-market variants except the SCAR 15P, ensuring ongoing availability for forces. This sustained production underscores the rifle's enduring role in U.S. elite units, with enhancements to components like rails and stocks periodically evaluated for future refinements.

International Operators

The adopted the FN SCAR-L and SCAR-H rifles in 2011 as their standard issue service weapons, replacing the aging across the Land Component. This procurement emphasized the SCAR's modularity and reliability for both close-quarters and longer-range engagements, with deliveries commencing shortly thereafter to equip frontline units. In , elite units such as the have employed the SCAR-H since the late 2000s for counter-terrorism and missions, valuing its adaptability in high-threat urban environments. Complementing this, the formalized adoption of the SCAR-H PR precision rifle variant in 2020 through a €100 million contract for 2,620 units, intended to supplant the FR-F2 bolt-action and provide enhanced accuracy for designated marksmen up to 800 meters. Several other nations have integrated the into roles, including the United Kingdom's , which utilizes the Mk 17 (SCAR-H) in limited quantities for its superior handling in dynamic combat scenarios. Similar limited adoption occurs with special forces in , , , and , where the rifle supports missions requiring rapid caliber swaps and barrel changes. India's also fields both SCAR-L and SCAR-H models for counter-terrorism duties. Other confirmed users as of 2025 include special forces in , , and . FN Herstal supports these international adoptions by offering customized configurations, including adaptations for metric calibers like 5.56x45mm or 7.62x51mm to align with recipient nations' ammunition standards and operational needs.

Combat Deployments and Feedback

The FN SCAR rifle family saw extensive combat deployment by U.S. forces in and from 2009 to 2021, where it supported missions requiring modular adaptability in diverse environments. The SCAR-H (Mk 17) variant, chambered in 7.62mm, proved particularly effective in these theaters for its role, outperforming the SCAR-L (Mk 16) in sustained operations due to fewer mechanical complications. In the post-2021 era, U.S. deployments of the have been limited following the withdrawal from , though it remains valued in for its versatility over legacy systems like the , enabling rapid caliber swaps and accessory integration without compromising core performance. Internationally, began transferring thousands of FN SCAR rifles to in 2022, with additional deliveries included in a €92 million package announced in January 2023, with Ukrainian forces employing them in frontline engagements against forces through 2025. Field tests and user reports underscore the SCAR's strengths in reliability, particularly in harsh conditions; in a 2007 U.S. Army extreme dust test simulating sandstorm environments, the SCAR-L recorded 226 malfunctions across 60,000 rounds, compared to 882 for the , highlighting its short-stroke gas piston system's resistance to . This superior reduced stoppages by over 70% relative to the M4, proving advantageous in dusty urban and desert operations. The rifle's modularity further enhanced its utility, allowing operators to reconfigure for close-quarters urban combat through quick barrel changes and rail-mounted optics, as noted in after-action reviews. Operator feedback from trials between 2007 and 2010 praised the SCAR's , including ambidextrous controls, a reversible charging handle, and extended rail for better suppressor compatibility and accuracy in suppressed fire—attributes that improved handling over the M4 in dynamic engagements. However, the 7.62mm SCAR-H faced criticism for its increased weight (approximately 8.5 pounds unloaded) and sharper impulse, which fatigued users during extended patrols compared to 5.56mm alternatives. High production costs, exceeding $2,000 per unit, also restricted broader adoption beyond elite units, despite its tactical merits. Early combat reports identified issues with compatibility, particularly double- and triple-feed malfunctions caused by feed lip deformation under stress, necessitating tweaks for reliable feeding in the SCAR-L; these were less prevalent in the SCAR-H due to its robust internals. Overall, while the SCAR excelled in reliability and adaptability for , its weight, , and expense tempered enthusiasm for full-scale replacement of existing rifles.

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