It seems like maybe I need to tighten the mag catch so the aluminum mags will catch. It's funny though. Originally, the aluminum mags would catch fine but the P-mags wouldn't. I had to smack the P-mags a little harder than I wanted to to get them to seat. Now it feels loose. But nothing has changed. I still haven't shot the rifle yet. Why would the aluminum mags drop free AND now the P-mags catch just like the aluminum ones used to?