The Knight's Armament Company SR-25 (Stoner Rifle 25), designated Mk 11 Mod 0 by the United States Marine Corps, is a semi-automatic weapon system based on the famous AR-10 designed by Eugene Morrison Stoner. It fires the 7.62×51mm NATO round from a 10 or 20-round box magazine, and is designed for parts commonality with the AR-15 and M16 platforms. USSOCOM took interest in the rifle in the late '90s, and was adopted by several special forces branches and the USMC in 2000. After about 15 years in service, it was phased out by the Marines and SOCOM for the modernized M110 and SSR Mk 20, respectively.
The SR-25 ACC (Advanced Combat Carbine) is a civilian variant of the SR-25, utilizing a more modern upper receiver configuration and an E2 bolt and gas system.
Variants of the SR-25 appear in three games in the Battlefield series. The Mk11 Mod 0 appears in Battlefield 3 and Battlefield 4, while the SR-25 ACC appears in Battlefield Hardline as the SR-25 ECC (Enhanced Combat Carbine).