Really nice arm brace - SB Tactical SBPDW Pistol Stabilizing Brace for Mil-spec AR-15 Receivers

I bought this for one of my pistol builds. Already own a couple purchased from another sight, and really like the brace. It saves a lot being the buffer tube, castle nut, and buffer tube end plate are all a part of the brace. I really like how it collapses down compact as well. Only down side is you can't use an extended takedown pin with it.