My magazine springs are really stiff, hard to get the 12th round in both, but never a problem firing. I've had it for about 4 months now. Don't believe I've ever had a ftf, only problem I've had was when the trigger guard cracked, didnt even notice at first, the slide locked back a couple of time but I hit therelease and it chambered and fired fine. finally inspected it, saw the guard was broke, and the slide release spring had popped out. Never didn't fire though. I've since replaced it with a cz-83 guard and the wolff 16lb spring.