Question

Hey yall. Hope yall are having a great day. Was just wondering if anyone has had a similar experience with their slide. When I take my slide off , and pull the striker back ALL the way with my thumb, one of my pistols has a pretty big hitch when you get all the way to the very back. It feels nice and smooth right until almost hitting the backplate. I have one other M&P slide that doesn’t do this, so I was just wondering if this is somewhat normal or what I could do to fix it ? I looked inside the striker channel and it didn’t appear to have any sort of debris or marring or burrs, so I’m kind of just confused what could be causing it lol. Any comments would be much appreciated.