The PTR 91 KFM4 is a pistol-configuration HK91 clone with a short barrel and no stock. Classified as a pistol under NFA regulations. Can be registered as an SBR or paired with a pistol brace. Fires the full .308 Win cartridge from a compact form. Type: Semi-Auto Pistol Action: SA Caliber: .308 Win Capacity: 20 Year introduced: 2012, USA Weight: 72 oz Overall length: 23" Status: Active Intended use: Collector, Tactical