This BCM AR-fifteen Full Lower Receiver W/A5 BUFFER incorporates a BCM intermediate duration receiver extension in addition to a Vltor A5H0 buffer to provide the many benefits of the Vltor A5 buffer system. The lower receiver is machined from 7075-T6 aluminum forgings using a Mil-Spec hard coat anodized finish https://a5bufferweightchart98269.aioblogs.com/82370076/ar-15-comprehensive-reduced-receiver-w-a5-buffer-bcmgunfighter-stock