The new CMMG MkGs Guard T is an AR-15 style semi automatic rifle designed using CMMG's patent pending radial delayed blowback operating system. This system easily allows for the use of the 9mm cartridge while reducing the overall weight of the platform along with the felt recoil. Additionally the using features a patent pending dual-pinned fully machined bolt catch linkage which makes the rifle easy to operate as well as intuitive. One of the biggest benefits of the Guard platform is that it feeds from factory GLOCK magazines. This allows you to tap into the supply of GLOCK magazines you may already have without having to shell out additional money. Finally the Guard is built from a Billet Upper Receiver and a Forged Lower Receiver. The aluminum is high quality 7075-T6 and will serve you well for years to come.SPECIFICATIONS:CMMG MkGs Guard T AR-15 Style Semi Auto Rifle 99AE631Radial Delayed Blowback Operation9mm Luger16.1" Medium Taper 4140 Chrome-Moly BarrelSalt Bath Nitride Finish1:10" Twist RateMuzzle Threaded 1/2x28A2 Flash Hider Muzzle DeviceBillet 7075-T6 Aluminum Lower ReceiverForged 7075-T6 Aluminum Upper ReceiverCMMG RKM11 KeyMod Free Float Hand GuardCMMG Single Stage Mil-Spec TriggerA2 Style Pistol GripM4 Buttstock6 Position Mil-Spec Receiver ExtensionGLOCK 9mm Luger 33 Round Magazine GLOCK Magazine CompatibleOverall Length: Collapsed 32.5"Overall Weight: 6lbsFinish: Matte Black