I have had my problems with this gun, no doubt but I have all of them except one ironed out or attributed to shitty ammunition (Winchester Universal 100rd birdshot).
The gun is a 930 Turkey with a +6 Nordic tube, low drag follower, GG&G bolt handle. I have stretched the shell release spring to .460 and it makes it cycle like a dream either by hand or by firing.
My problem lies in the fact that I can not I mean 100% can not get Remington Express 3" 15 Pellet buckshot to cycle, not even one shell. It will fire perfect, eject with authority but will not release the next round from the magazine tube. I can run a birdshot shell with a 3" buckshot next in line and it will load right up.
Now Mossberg experts what in the hell could cause this? I apparently have a one off isolated problem that can not be solved via Google.