Mossberg 590A1 dropping shells

[trackhazard]

Took my Mossberg 590A1 to the range for the first time today. Using range ammo which was Fiocchi low recoil 00 buck. I had issues with shells dropping everytime I would pull the pump back. The spent shell would eject and the lifter would lift but wouldn't grab the new shell from the tube and it would just drop out the bottom.

Interestingly enough, when I got home, I ran my Azoom snap caps through it and everything ejected and fed fine. I loaded it up with some Remington game load shells I got with the shotgun and cycled the action and again, everything worked like it should.

Is this an issue with the Fiocchi or my gun? Short stroking? Issue with interruptor or cartridge stop? What should I be looking for on my shotgun if it is a mechanical problem?

Only mods on gun are S&J extension, magpul forend and stock and fiber optic sight on barrel to replace bead. The gun came with the LPA trigger and fluted 18.5" barrel.

Thanks.

[alks207]

I recently had the same exact issue. What I found to be the problem was my shell catcher would sometimes not stop the next round and it would fall on the ground from the recoil. I carefully bent the shell catcher and zero problems since then. Hope this helps.

http://www.calguns.net/calgunforum/showthread.php?t=1111199

[Steve_In_29]

It definitely sounds like some kind of timing issue was going on. The shell isn't "grabbed" by anything, it is released when the shell stop is moved out of the way by the action bars.

On edit: Are you sure the rounds were falling out AFTER you pulled the forearm? Most of these problems are that the shell will self-eject from the magazine upon firing the weapon. Due to the shell stop bouncing out of the way under recoil.

[trackhazard]

Thanks for all the good ideas guys.

If the shells are popping out from recoil, that would make sense that I could not replicate the issue at home. However, from what I can see from others having this issue, the shell will drop directly out from the bottom without having to pump the shotgun. Mine definitely occurs only when pumping. It could be that the shells are not coming completely free of the tube after recoil and that the pumping action sweeps the lifter down and knocks the stuck shell free.

I am going to the range again on Saturday and will pay more attention to whats going on down there especially after recoil. Thanks again everyone.

[trackhazard]

So, I was playing with snap caps tonight and I realized I could replicate the error if I load the shells but not push them in all the way. The edge of the brass sits past the stop but gets caught on the front of the elevator. When I pump from that position, the elevator moves and the shell drops down from the bottom.

I am surmising that the recoil from the gun may be enough to push the shells in the tube past the stop but are stopping at front edge of the elevator which keeps them from simply dropping out. Will double check on Saturday but if this is the case, simply bending in the front of the stop should do it as long as its not enough to keep the shells from moving out of the tube, right?

[ojisan]

Yes.

[trackhazard]

You guys are probably sick of this thread so this will be my last update for anyone who may be having similar trouble.

Went to the range this weekend and shot mostly trouble free. There were a couple shells of Winchester mixed in with my Remington game loads. I noticed that the shotgun choked as I described on the Winchester but ran the Remington just fine. I picked up the shells and compared the rims and the winchester loads were definitely smaller in diameter than the remington loads. Not by much but I think enough so that it counts. My suspicions were further reinforced by the fact that the gun was also choking on some slug loads that also had slightly smaller diameters.

So if you are having this problem, check the diameters of the shells that you are chocking on with the ones that run fine. This should show you how much you need to adjust your cartridge stop.

Other than that, it was a fine day of shooting. Ran through 75 rounds of shotgun shells and it was a hoot.

[Steve_In_29]

With careful bending of the tip you should be able to adjust the stop to run reliably with any brand of ammo.