Beginning in 2004, US Navy SEALs officially began select operations with their new Mark 14 Mod 0 (Mk 14 Mod 0). The rifle system was eventually delivered into the inventory of the US Coast Guard and is currently being introduced by the US Army into select infantry squads. Up to the middle of 2010, at least 5,000 Mk 14 EBR systems were generated out of TACOM Lifecycle Management Command (LCMC) at the Rock Island Arsenal. As of this writing, these systems are in operational service with US Army forces operating in Afghanistan in support of Operation Enduring Freedom with two Mk 14 EBRs issued to each infantry squad. In practice, the Mk 14 EBR has proven to be an effective and highly modular system that supplies a low, contained recoil force when fired. Additionally, its conversion from existing M14 Battle Rifles ensures that procurement costs are kept to manageable levels.
At its core, the Mk 14 EBR is nothing more than a very modernized M14 Battle Rifle utilizing the same gas-operated/rotating bolt action of the original M14 as well as their air-cooled barrels. However, changes to the base system include an aluminum billet adjustable telescoping buttstock (complete with cheek rest), an M4-style pistol grip, cantilever mount, Harris-brand bipod, 4 x Picatinny accessory rails, a revised muzzle brake and a revised forward sight. A Mark 4 tactical scope is utilized for accurized work. Keeping its original Battle Rifle lineage intact, the Mk 14 EBR can be used for both Close-Quarters Combat (CQC) and long-range distance precision work. Despite the changes to the base M14 design, it is said that Mk 14 EBRs can be reverted back to their original M14 Battle Rifle forms if need be.
The Mk 14 EBR is chambered for the 7.62x51mm NATO cartridge and operates in a semi-automatic nature. The effective listed range is between 600- and 800-yards depending on conditions and operator training/experience. The weight of the firearm when empty is listed at 14.9lbs with a loaded weight of 16.6lbs and the magazine is a detachable box type offering 20 rounds of ready to fire ammunition. Muzzle velocity is reported at 2,600 feet per second while barrel length (utilizing original M14 barrels) measures in at 22 inches with an overall system length of 35 inches.
Externally, the Mk 14 EBR only retains some of the general appearance of the original M14 as new revisions abound - though the true M14 fan will be quick to point out some visual similarities. The most obvious is in the installation of the adjustable stock and pistol grip. Picatinny rails are set above the receiver and around the forend/barrel region, these capable of taking on various accessories including scopes (day/night types - even two different types at once), vertical handgrips, bipods and the like. The barrel extends a ways from the forend housing and features a baffled muzzle brake.
Civilian versions - including carbine and replica forms - of the Mark 14 Mod 0 rifle also exist from various manufacturers.
The United States Marine Corps entertained fielding the Mk 14 EBR but elected instead to further the development of their M39 EMR (Enhanced Marksman Rifle).
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