I have had a Glock 41 for years and it had been working fine. Now, it drops mags when I fire. Not the first bullet, not the last. I fire, the mag drops, and no bullet is loaded into the chamber. I am sure the mags are in the gun solidly before firing. I can hold the mag in with my left hand and the gun fires ok, it recycles normally. It is not the mags because I have a Glock 21 and the mags work fine in that. Is there apart that is failing that I can replace?