Good quality bcg - Stern Defense SD BU45 .45 ACP Bolt Carrier for AR-15 Glock-Pattern Upper Receiver

Using on a Foxtrot Mike build. Feeds like a dream with the right mags. But beware, I was using the recommended 11oz buffer I got at Midway and it was too short. The faux gas key was hitting the lower receiver and sheared off. Totally my fault. Reached out to Stern before I figured it out and they did contact me back. I will be replacing it with another Stern if still in stock.