POF Patriot with 16.5-inch barrel and short-stroke piston system. POF's standard AR-15 piston rifle featuring enhanced bolt and barrel. Type: Semi-Auto Rifle Action: Semi-Automatic Caliber: 5.56x45mm Capacity: 30 Year introduced: 2011, USA Weight: 68 oz Overall length: 33.5" Status: Active Intended use: Duty/General Purpose