I've had my Glock 21SF for about 6 months now. Have shot about 50 rounds through it. I was pushing the mag release to release a full mag and it fell out but the button was pretty stiff. Couple minutes later when I was messing with the Glock, the mag catch just fell out. I did a google search and it seems like this is pretty common with the ambi model 21SF. Anyone else have this problem. I thought these things were suppose to be indestructible. Calling Glock today to see what they have to say.