I asked the expert and he wasn't familiar with the problem, so I figured I'd ask you guys as well. Four 21SF ambi pistols that I know of are experiencing problems with the mag release. Three of them are sticking in the release position, and the fourth actually came completely apart. The fourth was on a two week old pistol. I called Glock and they said that they hadn't heard of this problem, but I remember their reluctance to admit fault when the 23s were breaking frames years ago. I'm still going back and forth with them, but in the mean time I'm going to retire my 1 year old SF for something that I can trust. I've not had problems with my pistol, but it's not worth the risk. Anyone else heard of issues with the ambi mag release?