The LWRC M6A2 is a short-stroke piston AR-pattern rifle used by US Army Special Forces and other SOF units. The piston system provides greater reliability when suppressed and in adverse conditions compared to direct impingement alternatives. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 5.56x45mm Capacity: 30 Year introduced: 2006, USA Weight: 7 oz Overall length: 32.5" Status: Active Military use: Yes Intended use: Military, Special Operations