This spring here, The dog follower its attached to it, How does yours look? My gun beats the crap out of them, Benelli M2 is a direct replacement. Also had issues until I replaced the spring. The two other spots I have the pen pointed at I keep a little grease on, Without it my gun will start have issues. Once there's some on there it will run hundreds of rounds at a time zero issues.
Also posed the marks where challenger shells would bind against the receiver walls
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I will try this. At this point I would give anything a whirl.
You mention the Benelli M2 spring is a direct replacement, do you know if the M4 is a direct swap too? I ask as I have an M4 and could borrow it. I am not home right now to check but I stripped the M4 the other night and had that specific spring out and it looked pretty similar.




















































