bsoppet wrote:Digitcontrol has given you a good road map in which to trouble shoot your problem. I experienced your exact same problem and traced it down to the mag follower engaging the slide lock lever prematurely. I solved the problem by filing the lip of the follower a little at a time until the last round would feed reliably and still lock the slide back after last round is fired. BTW, I have the 22TCM double stack.
I had the same problem with one of my magazines and the file made it function perfectly.