The 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 is currently being phased out by the Marines and SOCOM for the modernized M110 and SSR Mk 20, respectively.