I love the stock. Haven't took it out yet. 5 round mag won't catch even if you slap it up, and you can pull it out with hand. I ordered a 10 rd AI mag and it does catch and you need mag release to detach mag. Contacted AI and they wanted me to send stock in. Luckily I got 10 rd mag and it seems to work properly. Now I have to send just the 5 rd mag to them.