The PWS MK107 Mod 1-M is a short-barreled AR-pistol featuring a 7.75-inch barrel and PWS's long-stroke piston system. The M-suffix denotes the MFT furniture package including the Mission First Tactical stock and pistol grip. It is built for close-quarters use. Type: Pistol Action: Long Stroke Piston Caliber: 5.56x45mm Capacity: 30 Year introduced: 2016, USA Weight: 6.8 oz Overall length: 22.5" Status: Active Intended use: Home Defense, Duty, Range