LBE Unlimited AR-15 Mil-Spec Buffer Tube Kit Features The LBE Unlimited Buffer Tube Kit is built around a six position mil-spec diameter buffer tube that accepts standard carbine stocks without fitment issues. Paired with a carbine length recoil spring and an H1 heavy recoil buffer the kit is tuned to run smoothly in AR-15 platforms chambered for a wide range of calibers. The heavier H1 buffer mass helps slow bolt carrier velocity which reduces felt recoil and softens the cycling impulse on the shooter s shoulder. That combination of components gives builders a dependable already-matched buffer system instead of sourcing parts separately. Rounding out the kit is a mil-spec receiver end plate and castle nut both needed to properly secure the buffer tube to the lower receiver. The matte Black finish matches common AR-15 hardware keeping the build looking factory clean. Precise manufacturing and durable materials mean the kit is built to handle the wear of repeated use without loosening or failing. For anyone assembling a new AR-15 lower or replacing a worn buffer system the LBE Unlimited Buffer Tube Kit offers a complete five piece solution for sale at GrabAGun. LBE Unlimited AR-15 Mil-Spec Buffer Tube Kit Specifications Manufacturer: LBE Unlimited Model: Buffer Tube Kit Color: Black Finish: Matte Compatible Hosts: AR-15 Includes: H1 Buffer Buffer Tube Recoil Spring End Plate Castle Nut Pieces: 5 Available At: GrabAGun