Long-stroke piston AR-15 variant with PWS' enhanced BCG, full-length Picatinny rail, and adjustable gas piston system. Primary Arms's choice for a reliable piston AR at the production level. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2011, USA Weight: 105.6 oz Overall length: 35.5" Status: Active Intended use: Tactical, Hunting