10 lb (4.5 kg) (fully loaded, heavy barrel and optic mounted)
Length
37.5 inches (952.5 mm)
Barrel length
MOD 0/1 variant: 18 in (457.2 mm)
MOD H variant: 16 in (406.4 mm)
Cartridge
5.56×45mm Mk 262
Action
Gas-operated, direct impingement, rotating bolt
Muzzle velocity
2,750 ± 20 ft/s (838.2 ± 6.1 m/s) using Mk 262 Mod 1 ammunition
Effective firing range
700 m (770 yd)
Feed system
20- or 30-round STANAG magazine[1]
The United States Navy Mk 12 MOD 0/1/H Special Purpose Rifle (SPR) 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 weapons.[2][3] SPR initially stood for Special Purpose Receiver as it referred to an add-on upper receiver assembly (part of the proposed SOPMOD upgrades),[4][5] but that nomenclature changed to Special Purpose Rifle as the weapon became a stand-alone weapons system.[6]
The SPR was eventually type-classified by the U.S. Navy as the Mk 12.[6] The weapon was developed by the Naval Surface Warfare Center Crane Division for US military special operations units.[6]
The rifle is designed to fire semi-automatically, although it has the option to fire in full auto in case of emergencies.[7]
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