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British L129A1 Sharpshooter Rifle

2018, Small Arms Defense Journal

With the trend toward so-called “intermediate caliber” cartridges following World War II, several influential studies deemed the range requirements for contemporary infantry small arms to be substantially less than provided by earlier, “full-power” rifle cartridges. In several reports—including the important Hall and Hitchman reports of the 1950s—ranges of no more than 300 meters were anticipated for most infantry engagements. With increasingly responsive and accurate firepower, especially airpower, some later military thinkers envisaged the role of small arms further diminishing. In recent conflicts, particularly Afghanistan, however, infantry small arms have played a more pivotal role than was anticipated on a “modern” battlefield. As one of the authors wrote in two of his recent reports: “Traditional supporting fires—delivered by heavier weapon systems such as artillery and air-delivered munitions—were often restricted under rules of engagement or operational practices. Meanwhile, opposition forces have increasingly operated from within civilian communities, and military leadership and popular opinion have exhibited a lower tolerance for civilian casualties.”

ARMAMENT RESEARCH SERVICES Small Arms News from the World’s Hot Spots CHLOE TOUSIGNANT/ARES ARES Director N.R. Jenzen-Jones firing the L129A1 at the Defence Academy of the United Kingdom at Shrivenham in February 2017. British L129A1 Sharpshooter Rifle By Ian McCollum & N.R. Jenzen-Jones With the trend toward so-called “intermediate caliber” cartridges following World War II, several influential studies deemed the range requirements for contemporary infantry small arms to be substantially less than provided by earlier, “full-power” rifle cartridges. In several reports—including the important Hall and Hitchman reports of the 1950s—ranges of no more than 300 meters were anticipated for most infantry engagements. With increasingly responsive and accurate firepower, especially airpower, some later military thinkers envisaged the role of small arms further diminishing. In recent conflicts, particularly Afghanistan, however, infantry small arms have played a more pivotal role than was anticipated on a “modern” battlefield. As one of the authors wrote in two of his recent reports: “Traditional supporting fires—delivered by heavier weapon systems such as artillery and air-delivered munitions—were often restricted under rules of engagement or operational practices. Meanwhile, opposition forces have increasingly operated from within civilian communities, and military leadership and popular opinion have exhibited a lower tolerance for civilian casualties.” As a result, infantrymen were frequently forced to engage enemies at longer ranges than anticipated, regularly beyond 300 meters and often beyond the 500-meter effective range of, for example, the U.S. Army’s M4-series standard rifle. “U.S. Army data suggests that more than 50 percent of the small arms engagements in Afghanistan in 2011 required U.S. Army forces to engage targets beyond 500 meters. For their part, opposition forces would engage InternaSADJ VOL.10 NO. 4 | 67 | JUN/JUL/AUG 2018 tional Security Assistance Force (ISAF) units from ranges of up to 900 meters or farther, employing full-power-caliber GPMGs and designated marksman rifles (DMRs).” This threat “overmatch” has been a driving factor behind the rapid adoption or increased issue of various full-power DMRs and GPMGs by several NATO and other forces, as well as an increased interest in so-called “general-purpose calibers.” Different armed forces drew on existing stocks of GPGMs, in many cases, as well as purchasing new machine guns chambered for full-power rifle cartridges, such as the Mk 48 as adopted by the U.S. and the FN Herstal Minimi in 7.62x51mm adopted by the New Zealand Army. These were supplemented by a number of DMR-type weapons, with both modernized variants of available weapons such as the U.S. devel- N.R. JENZEN-JONES/ARES opment of the Mk 14 Enhanced Battle Rifle (EBR) series, and new weapon systems, such as the Australian acquisition of the Heckler & Koch HK417, seeing service. The British acquisition of the L129A1 followed this same trend, with the British Ministry of Defence issuing a 2009 Urgent Operational Requirement for a self-loading “sharpshooter” rifle “specifically to fill a need in Afghanistan.” The weapon was to be suitable both for use as a DMR and in close-quarters battle (CQB) scenarios. Various manufacturers submitted rifles; after several testing stages, the final contenders for the role were the Heckler & Koch HK417 and the Lewis Machine & Tool LM7. LMT, partnered with Law Enforcement International (LEI) of the U.K., eventually won the contract. Their offering was type classified as the L129A1 and formally adopted in October 2009, with 440 L129A1 rifles purchased for some 1.5 million GBP. These entered field service by May 2010, and subsequent purchases have since been made. LMT and LEI partnered to enter the LM7, the export version of LMT’s LM308MWS, into the sharpshooter trials program. This is essentially an SR-25-type self-loading rifle, using the original Stoner quasi-direct-impingement action and a multi-lug rotating bolt. Original guns, acquired under the UOR, were built on machined billet receivers. Later guns have been built around the LMT Monolithic Rail Platform, a one-piece upper receiver milled from a single 7075 T6 aircraft aluminum forging. The weapon’s case deflector has been through three iterations. With the billet receiver guns, a flat-topped “bump” shape was machined and added. This was then adjusted to a forged design, before a customer requirement in advance of the 2012 Olympics was met by modifying the design so that it deflects ejected cartridge N.R. JENZEN-JONES/ARES cases out at the two o’clock position instead of a typical three o’clock position as is standard on the LM308MWS. According to one industry source, this was so that the L129A1 could be better used from helicopter platforms, such as was seen during the 2012 London Olympics. The concern was that brass ejected at a traditional position would be more likely to fall back into the helicopter and create a safety hazard for the crew. As part of LMT’s Modular Weapon System (MWS) family, the L129A1 features a 16-inch heavy stainless steel barrel that can be quickly swapped out. LMT produces compatible barrels in 13.5-, 16-, 18and 20-inch lengths. The internal components are of similarly high quality. As Chris Bartocci notes: “In keeping with the original AR-10 design, the bolt and bolt carrier are chrome-plated. Chrome is much easier to clean than most finishes, is corrosion-resis- SADJ VOL.10 NO. 4 | 68 | JUN/JUL/AUG 2018 tant and has self-lubricating properties. The rifle uses an H3 buffer with three tungsten weights. The bolt carrier has a captive firing pin retainer pin—a major plus when cleaning a rifle in the desert. A cotter pin is easy to lose in the sand, and this design prevents that. The bolt, like the barrel, is test-fired with a proof cartridge, magnetic-particle-inspected and marked “MP” to indicate the testing was done. Also, Lewis improved the hammer/trigger pins by incorporating a swell on one end, making them easier to remove.” The rifle is issued in British service with a Trijicon TA648-308 6x48mm (ACOG) illuminated optic for precision engagements. The ACOG is fitted with a Picatinny rail to which is mounted a Trijicon RM01 1x Ruggedized Miniature Reflex (RMR) for CQB use. The L129A1 is fitted with a two-stage match trigger with a 4-pound trigger pull. Unlike some similar programs in the U.S., the N.R. JENZEN-JONES/ARES British requirement was for the Sharpshooter rifle to fire standard 7.62x51 L2A2 ball ammunition produced in the U.K. at Royal Ordnance Factory, Radway Green (RG). According to Greg Felton from LEI: “The ammunition criteria stated by the MOD was that the rifle was to be able to use both RG 155-grain sniper ammunition, plus M80 ball and tracer, including de-linked machine gun belts. In the end, during their trials with the various competitors, they found that the 155-grain fired so much better than the standard ball that it was made the official issue ammunition for the weapon. As to what it is “matched to,” [Karl & I] designed the rifle to use both standard ball and 168-grain Match. With a 1:11.25-inch twist it works well with these weights, however, the heavier 175grain projectiles need a faster twist for the best results at longer ranges.” The L129A1 was issued at section level in the British Army, with one soldier in eight carrying the rifle. Three soldiers per section would be trained on the rifle, should they need to take over its operation. The relative heaviness of the L129A1 and good field of view of its optic make the weapon particularly amenable to rapid follow-up shots, a Technical Specifications Caliber: 7.62x51mm Overall length: 990.6mm (stock extended Overall length: 901.7mm (stock collapsed) Barrel length: 406mm (16 inches) Weight (unloaded): 4.50kg Feed device: 20-round detachable box magazine key performance characteristic in the DMR role. It has proved effective and popular amongst British forces. One British soldier who spoke to ARES about the weapon described it as “comfortable and easy to shoot.” During our brief time on the gun, we found that to be true. The LM308MWS, on which the L129A1 is based, is also in service with other military and law enforcement customers. The British Army is currently looking to expand the role of the L129A1, considering issuing it as a sniper support weapon. However, this would SADJ VOL.10 NO. 4 | 69 | JUN/JUL/AUG 2018 involve a change in anticipated targets to include enemies wearing modern body armor, which the current 7.62x51mm ball projectiles are not particularly good at defeating at longer ranges. A new projectile with a mild steel penetrator core (similar in principle to the 5.56x45mm SS109 projectile)— but with ballistics matching the ball cartridges already in service—has been developed to allow the L129A1 to fill this new role if desired. *** This article is part of a series of collaborative works produced by ARES Researcher Ian McCollum, who also runs the Forgotten Weapons blog and YouTube channel, in conjunction with ARES Technical Specialist Jonathan Ferguson and ARES Director N.R. Jenzen-Jones. Using access to unique collections facilitated by ARES, the series examines a range of interesting weapons in both video and print formats. Special thanks to the Defence Academy of the United Kingdom at Shrivenham, for allowing us to handle and fire an L129A1 rifle, and to Neil Grant. This article is courtesy of Armament Research Services (ARES). See www.armamentresearch. com for further original content.