This BCM AR-15 Comprehensive Lower Receiver W/A5 BUFFER incorporates a BCM intermediate duration receiver extension in addition to a Vltor A5H0 buffer to deliver some great benefits of the Vltor A5 buffer method. The lessen receiver is machined from 7075-T6 aluminum forgings with a Mil-Spec tough coat anodized end https://eddief097ncn3.hyperionwiki.com/user