Mk 12 Mod 1

The M110 Semi-Automatic Sniper System is a gas-operated semi-automatic sniper rifle used by the US military, built on the Knight's Armament Company SR-25 platform. It features a free-floating barrel, URX rail system, and fully adjustable buttstock. The M110 gave US Army snipers a semi-automatic capability previously lacking in the M24 bolt-action platform.

The Mk 11 Mod 0 is a semi-automatic sniper rifle used by the United States Navy SEALs and other special operations forces. It was developed by Knight's Armament Company as a variant of the SR-25 design. The Mk 11 is chambered in 7.62x51mm NATO and features a free-floated barrel and an adjustable gas system. It has a shorter barrel than the M110 SASS and uses a fixed stock rather than the adjustable stock of the M110. The rifle is known for its exceptional accuracy for a semi-automatic platform.

The Knight's Armament Company SR-25 (Stoner Rifle 25) is an American semi-automatic precision rifle designed by Eugene Stoner in the early 1990s. Chambered in 7.62×51mm NATO, it is the direct predecessor to the U.S. military's M110 SASS and is widely used by special operations forces and civilian precision shooters.