I need some of you Beretta wizards to help me out...
I had the front fiber optic site changed out with a tritium front sight at a shop that has always done a pretty good job. when I got home inserted an empty magazine and I noticed that the slide did not lock back. I figured well this mag must be at the end of its days so I opened it up stretch the magazine spring out and sure enough it locked back. I assume that my problem is solved but then when I went home I tried several other empty magazines and none of them would lock it back unless i pulled the slide very firmly and fast to the back. I have two other Beretta 92s one with many thousands of rounds through it and neither of them exhibit this behavior. The gun only had 50 rounds through it before I dropped it off but I do not recall this before. Ideas?