I bought a Colt Commander (Wiley Clapp). 45 cal. NIB. about a month ago. Of course it came with only one magazine (colt) so I picked up an extra Wilson Combat Mag. Here’s the age old problem... it won’t lock back on the last shot. Bad mag? Weak spring? Colt just doesn’t like Wilson? It’s interesting that I have read that the colt mags are junk but, the one I have works just fine. Now, I’ve only ran 200 rounds through it though but not all with the colt mag. McCormick mag I have works fine also. Is it a compatibility issue?