The new SBA3 Brace from SB Tactical might be the brace that we have all been waiting for to free us from dependence on specialized pistol receiver extensions.
The SBA3 is a 5 position pistol brace that is adjustable for length (5 positions) and fits a standard AR-15 mil-spec receiver extension (included). It also includes an integral QD sling swivel socket.
Check out the SBA3 at SB-Tactical.com.
Yeah, but they are not selling it without a receiver extension. Already have a pistol that I built with only a receiver extension and a cover.