The PWS MK112 in .300 Blackout is a 12-inch pistol-configuration piston AR designed for suppressor use. The long-stroke piston system is particularly well-suited to .300 BLK subsonic loads, providing reliable cycling without the gas blowback issues that plague direct-impingement .300 BLK pistols with suppressors. The 12-inch barrel maximizes subsonic velocity and compactness. Type: Pistol Action: Semi-Automatic Caliber: .300 Blackout Capacity: 30 Year introduced: 2013, USA Weight: 68 oz Overall length: 23.5" Status: Active Intended use: Suppressor Host, Duty Use, Home Defense