PWS MK111 in .300 Blackout with 11-inch barrel and long-stroke piston system. The piston operation is particularly advantageous for .300 BLK subsonic loads which have lower gas port pressure than supersonic 5.56 loads, providing more consistent cycling across the full range of .300 BLK ammunition. Type: Pistol Action: Semi-Automatic Caliber: .300 BLK Capacity: 30 Year introduced: 2014, USA Weight: 102 oz Overall length: 26.5" Status: Active Intended use: Suppressed Shooting, Hunting, Tactical