MK12

Designed by Knights Armaments as the PROTO-1 (SR25) for Naval Surface Warfare Center Crane Division (NSWCCD) SOCOM, the Mk12 Mod 1 Special Purpose Rifle (SPR) is a gas-operated, rotating-bolt Designated Marksman Rifle (DMR) chambered in 5.56mm NATO developed for US Navy Special Operations and services by US Marines since 2002. The US Army adopted a variant of the rifle in 2011 rebranding it as the M110 Semi-Automatic Sniper System (SASS), replacing the H&K G28 as the preferred DMR.