The M4A1 SOCOM is the full-auto military issue carbine adopted by U.S. Special Operations Command in 1994. Commercial semi-auto versions are sold as display models and curio pieces; genuine full-auto M4A1s are restricted to military and LE. 14.5-inch barrel requires pinned muzzle device for legal 16-inch overall. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 5.56x45mm Capacity: 30 Year introduced: 1994, USA Weight: 6.36 oz Overall length: 33" Status: Active Military use: Yes Intended use: Military, Patrol