The Mk 12 Mod 1 SPR features an 18-inch SPR barrel with a PRI free-float handguard and Ops Inc suppressor collar. A refined variant of the Mod 0, issued to Army Special Forces and used extensively in OIF and OEF. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 5.56x45mm Capacity: 20 Year introduced: 2003, USA Weight: 7.9 oz Overall length: 35" Status: Active Military use: Yes Intended use: Military, Special Operations, Precision