The CMMG MkG-45 Guard is a AR15 chambered in the iconic .45 ACP. The Guard is fed from factory Glock 21 magazines and uses CMMG’s patent pending Radial Delayed Blowback operating system that tames the .45 ACP cartridge while simultaneously reducing the weight and felt recoil of the rifle. It also features a new patent pending dual-pinned, fully machined bolt catch linkage, making operation of the rifle both easy and intuitive. The GUARD is threaded to accept most common .45 ACP suppressors and is the perfect carbine for defending your home or enjoying a day at the range.Specifications:- Barrel: 8″ 1:16 Twist, Medium Taper 4140 SBN Barrel- Muzzle: CMMG SV Brake, Threaded .578-28- Hand Guard: CMMG RKM7- Furniture: Magpul MOE Pistol Grip, KAK Shockwave Stabilizer and Tube- Receivers: Billet 7075-T6 AL Lower, Forged 7075-T6 AL Upper- Trigger: CMMG Single Stage Mil-Spec style trigger- Weight: 4.7 lbs. (Unloaded)- Length: 24?