The PWS MK116 18-inch is the designated marksman configuration of PWS's flagship long-stroke piston AR. The 18-inch chrome-lined barrel extends the 5.56 NATO cartridge's effective range while the piston system maintains the cleaner-running characteristics PWS is known for. A rifle-length gas system further smooths the operating cycle. Used by some law enforcement precision rifle teams. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2011, USA Weight: 74 oz Overall length: 36.5" Status: Active Intended use: Precision Rifle, Patrol Rifle, Duty Use