Mk 12 Special Purpose Rifle
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The United States Navy Mk 12 MOD 0/1/H Special Purpose Rifle is a designated marksman rifle that was in service with United States Special Operations Forces in the designated marksman role until 2017, also designed to be shorter than standard... Wikipedia
Action: Gas-operated, direct impingement, rotating bolt
Cartridge: 5.56×45mm Mk 262
Effective firing range: 700 m (770 yd)
Feed system: 20- or 30-round STANAG magazine
In service: 2002–2017
Length: 37.5 inches (952.5 mm)
Muzzle velocity: 2,750 ± 20 ft/s (838.2 ± 6.1 m/s) using Mk 262 Mod 1 ammunition