This BCM AR-15 Finish Lower Receiver W/A5 BUFFER incorporates a BCM intermediate duration receiver extension in addition to a Vltor A5H0 buffer to deliver the many benefits of the Vltor A5 buffer method. The lower receiver is machined from 7075-T6 aluminum forgings with a Mil-Spec tricky coat anodized end https://caidenzefed.ageeksblog.com/28147798/ar-fifteen-total-lessen-receiver-w-a5-buffer-bcmgunfighter-stock