The PTR 91 SC is the squad carbine variant with a polymer adjustable stock that provides more length-of-pull adjustment than the standard PTR 91 configurations. The 18-inch barrel and roller-delayed blowback mechanism are unchanged. The SC stock was developed to accommodate a wider range of shooters in law enforcement agencies where officers of varying sizes share patrol rifles. A practical improvement over fixed-stock variants for shared-equipment environments. Type: Rifle Action: Semi-Automatic Caliber: .308 Win Capacity: 20 Year introduced: 2009, USA Weight: 194 oz Overall length: 40.5" Status: Active Intended use: law_enforcement, sporting