I think I discovered the issue. I figured I'd try a new spring next so took the spring out of my deactivagted M95 and noticed right away that this was an inch longer than the original. So, must be the spring tension. Put it together and the problem was actually a little worse. So I tried putting the deactivated bolt in without the head. Fit right in and locked in place. But then it wouldn't come out. Knowing the modification to these which removed the front lug of the rear catch I pulled the magazine well out so I wouldn't harm that in any way. Bolt then came out without any problem. Went in, locked, then came out with normal pressure. With the magazine well removed, I can see how it is supposed to function. The rear bolt catch holds on the front lug which is removed in the M95M so that the bolt operates with the internal clip. So rather than a wear issue, it appears to be a design issue and is probably consistent with all M95M's. I can imagine soldiers getting in the habit of pushing the bolt in with their thumb as they pull the trigger. Probably a drawback of modifying an existing rifle to a new configuration.