I have 1 FAB defense survial stock for sale. It is very lightly used and I don't have a use for it anymore. This stock has a slot with release that can hold spare AR magazine and works with everymag i tested including lancer mags and magpul mags with no problems. It comes with a 10 round magazine and the stock fits both commercial and milspec buffer tubes (it has a pressure clamp built into the stock body). Sling quick detach socket is also built into the stock on both sides. $90 (cash only) takes it.