PWS MK116 AR-15 in .300 Blackout with 16-inch barrel, applying PWS's long-stroke piston system to the subsonic-capable hunting and tactical cartridge. Type: Rifle Action: Semi-Automatic Caliber: .300 Blackout Capacity: 30 Year introduced: 2015, USA Weight: 112 oz Overall length: 32" Status: Active Intended use: Suppressor Host, Tactical, Hunting