TacFire AR Build Kit Features The TacFire AR Build Kit centers on a 16 .45 ACP barrel finished in black nitride with a 1:16 twist rate matched to the heavier slower-moving bullets typical of the cartridge. A birdcage flash hider with a crush washer caps the muzzle controlling flash signature while staying easy to install and torque correctly. The stripped billet AR-15 upper receiver includes M4 feed ramps for reliable feeding and is designed to accept the included .45 ACP bolt carrier group for proper function in a pistol-caliber platform. A 15 slim M-LOK free float handguard wraps the barrel giving the shooter mounting options for lights optics and other accessories along the full length of the rail. Beyond the upper the kit supplies the hardware needed to complete a functioning AR-platform rifle including a Mil-Spec/commercial-spec charging handle with a durable steel latch a dust cover and a forward assist for reliable bolt closure. A standard receiver end plate and Mil-Spec castle nut secure an aluminum buffer tube fitted with a 5.5 oz 9mm buffer and spring tuned for the cycling characteristics of a straight-walled pistol cartridge. A USA-made lower parts kit and an A2-style black pistol grip round out the build giving the assembler everything needed to finish a semi-auto lower. As a Sports South exclusive package this kit offers builders a streamlined path to a complete .45 ACP AR-platform rifle. TacFire AR Build Kit Specifications Manufacturer: TacFire Model: AR Build Kit Caliber: .45 ACP Compatible Hosts: AR-Platform Barrel Length: 16 Twist Rate: 1:16 Color: Black Nitride Action: Semi-Auto Grip Type: Black A2 Pistol Grip Includes: Lower Parts Kit Description: Sports South Exclusive Available At: GrabAGun