The M110 Semi-Automatic Sniper System (M110 SASS) is

The M110 Semi-Automatic Sniper System (M110 SASS) is an American semi-automatic sniper rifle/designated marksman rifle that is chambered for the 7.62×51mm NATO round. It was developed by U.S. firearm manufacturer Knight's Armament Company.
The M110 Semi-Automatic Sniper System is intended to replace the M24 Sniper Weapon System used by snipers, spotters, designated marksman, or squad advanced marksmen in the United States Army. The United States Marine Corps also uses the M110 to replace some M39 and all Mk 11 as a complement to the M40A5. The rifle has ambidextrous features such as a double-sided magazine release, safety selector switch, and bolt catch.