Hi all having a weird issue with a used M&P Pro 4.25 I just bought. The guy I bought it from had two slides for it, the 4 inch and a 5 inch. When I examined the gun and dry fired it, it worked fine but it has the 5 inch slide. I got it home and put the shorter slide on it, and it failed to function. I had another short slide as well as another 5 inch slide and they all function as expected with one oddity.
My 5inch 40 slide works fine but has issue going into battery on new frame, I suspect the recoil spring. Works fine on my other two frames.
5 inch 9 slide works on all frames.
4 inch 9 slide works on all frames. Only hiccup is to teak down gun on new frame, I need to push up on slide release.
4 inch pro slide works on all frames but the new one. If I pull the trigger without cocking the striker, there is a little rearward motion on the slide that is not there with the others. If I put a little rearward pressure on the muzzle, it will function, otherwise, nothing.
I compared the two 4 inch strikers and no noticeable difference. The only difference between the four slides is the bum one does not have an apex striker block. I also noticed quite a bit of motion in the trigger assembly when pushing up on the slide lock with the slide off. The trigger return spring would stretch and trigger bar would move. Fresh return spring fixed those issues, but still did not remedy the issue of the striker not releasing. Any ideas? Would like to remedy the issue myself rather than send it in.