LBE Unlimited Mil-Spec Buffer Tube Kit Features The LBE Unlimited Mil-Spec Buffer Tube Kit bundles every part needed to complete a 4 position buffer tube assembly on an AR-15/M4 platform rifle. The 4 position buffer tube itself sets the mil spec standard for stock compatibility ensuring a wide range of aftermarket stocks will fit without modification. A castle nut and standard end plate secure the tube to the receiver extension threads providing a stable rattle free connection between the buffer tube and the lower receiver. Rounding out the kit a carbine length recoil spring and a standard recoil buffer work together to manage bolt carrier group cycling and felt recoil during firing. Finished in matte black the kit measures 11 inches overall and is built entirely in the United States reflecting LBE Unlimited s commitment to domestic manufacturing and quality control. From upper receivers and bolt carrier groups to barrels grips gas tubes and buffer tubes LBE Unlimited designs and builds its components stateside to support American jobs and consistent part tolerances. This buffer tube kit gives a builder a single reliable source for the hardware behind a collapsible or fixed AR-15 stock setup. For anyone completing a build or replacing worn buffer components the LBE Unlimited Mil-Spec Buffer Tube Kit covers the full assembly in one box. LBE Unlimited Mil-Spec Buffer Tube Kit Specifications Manufacturer: LBE Unlimited Model: Mil-Spec Buffer Tube Kit Color: Black Finish: Matte Compatible Hosts: AR-15 / M4 Platform Description: 4 Position Length: 11 Available At: GrabAGun