The PWS MK220 is a 20-inch precision .308 long-stroke piston rifle designed for designated marksman roles. The long-stroke piston system provides reliable operation in adverse conditions while the 20-inch barrel maximizes .308 ballistic performance. A free-float handguard and adjustable gas system allow tuning for different ammunition loads. One of the most capable factory piston .308 ARs available. Type: Rifle Action: Semi-Automatic Caliber: 308 Winchester Capacity: 20 Year introduced: 2014, USA Weight: 122 oz Overall length: 40.5" Status: Active Intended use: Precision Rifle, Patrol Rifle, Long-Range Shooting