PTR Industries PTR-114: This rifle is a newly manufactured HK 91 Rifle clone by PTR Industries. PTR is the industry leader in Roller Delayed Blowback Action Firearms. The A3SK models are equipped with a 5/8x24 threaded flash hider. Also featured is a 16\" 1:10 twist barrel makes this model more maneuverable than the longer variants. These incredible rifles feature an HK Navy style polymer lower with a Paddle Mag release. It comes with a slim black polymer stock and handguard. The Gun has a black powder coat finish and welded scope mount.