Last time at the range my CW380 failed to lock open on final round a few times. I checked and the stop was not being pushed all the way into the slot. The mag spring is now only about an inch longer than the mag. I bent the front of the top loop of the spring up and it cured the problem. I have two mags and they both stay loaded all of the time with carry ammo, about 21 months of sitting. Since I use both at the range they have no more than 150 cycles on them. Seems to me like it is awfully soon for them to fail. Piss poor performance in my opinion. Magguts on order. People here seem to think a lot of them so hopefully their springs will last longer. The extra rounds will be good to.