Great bolt - Stern Defense SD BU45 .45 ACP Bolt Carrier for AR-15 Glock-Pattern Upper Receiver

I live in Cali, so I had to use a Mag-Ad, and the Stern was my choice from reputation, and their reputation holds true. Great quality bolt. If you are using the Stern Mag-Ad, you HAVE to use this bolt. The Stern Mag-Ad takes S&W mags, so you are limited in mag capacity. I was using a Foxtrot bolt and it would jam pretty much every shot. Save yourself the frustration, get this bolt if you are going to use their Mag-Ad. You will also need their 11oz buffer.