The PTR 91 PDW is configured with the HK-pattern folding buttstock making it one of the most compact .308 roller-delayed configurations available. With the stock folded it measures under 30 inches despite a full-length 18-inch barrel. The PDW designation reflects the compact, foldable configuration rather than any reduction in lethality — it fires the same full-power 7.62x51mm round. Type: Rifle Action: Semi-Automatic Caliber: 7.62x51mm NATO Capacity: 20 Year introduced: 2008, USA Weight: 192 oz Overall length: 40.2" Status: Active Intended use: tactical, sporting