89M1S90

I am and assumed the OP was, as well.

Have not been on in a while and just came across this. I put a card on my '89 M1 Super 90. I have tried to get it to malfunction with everything from light #4 bird up to 3" 00. It cycled perfectly every time. I also have a light and a sling on this gun. That's not to say yours will work as well, but the chances are pretty good.

That is quite possible. I am going back to the Federal LE127 00 (1,325 fps) for more reliability and due to the pattern. Out of my M1S90, the 1,325 fps load holds a tighter pattern longer than the 1,145 fps.

Yes, I took the stock off and replaced it. The action spring was fine. I have never considered the stock nut being overtightened causing an issue and cannot say one way or the other if it was the problem. Though I found I do not like the Speed Bead and do not plan to put it back on, I was looking for possible answers in case I can ever help someone else with the same issue. Thanks for the possible solutions!

I got a good deal on Federal PD132 00 (1,145fps 00 flight control) and bought a bunch. However, I was very disappointed when my '89 M1S90 would not cycle it. i have had this load in the past and run it without issue. After shooting, I decided to clean her up. Found I could not remove the trigger group due to the Speed Bead binding against it, so I removed the Speed Bead. Then it struck me: maybe the Speed Bead was the issue. So, with the Speed Bead gone and the shotgun still dirty, I went back to the range. I ran 4 boxes of PD132 00 through it flawlessly. The Speed Bead was the issue, though I cannot figure out WHY. Any thoughts out there? Any similar experiences? Planned to remove the speed Bead anyway, did not care for it.