Answer

I’d bend before removing simply because you can unbend and you can’t easily unremove. But if it’s new, call Mossberg. They may send you new parts or simply repair under warranty. Jeff

Follow-up on question

Thanks Bro that makes the most sense and was really my first thought, but do YOU agree that the cartridge stops are most likely causing this symptom???

Answer

Just when does the shell drop out? If the magazine is loaded, chamber empty, and you pump the action, does the first round load into the chamber and the next round is on the ground? Explaining the sequence of events leading up to the shell on the ground would help.

Follow-up info

Sometimes it is the first or second but usually it’s the last. It doesn’t seem to matter how many rounds are in the magazine at the time. What do you think?

The cartridges only fall out when I CLOSE the action (makes sense)…..Pike

Answer

With the gun empty if you load one shell in mag and pump the gun where does the shell end up?

With the gun empty if you load two shells in the mag and pump the gun where is the first shell,where is the second shell and what happens if you pump the gun a second time?

Is the cartridge lifter straight and doesn’t bind, goes high enough and low enough?

If after watching and you decide the cartridge stop or the cartridge limiter needs adjusting you can bend them.

You have the gun in front of you work the action slowly watch all the moving parts, you may have to do this a few times. Does the cartridge stops have enough purchase on the rim of the shell, is the lifter reacting with the stops properly, some of the things to watch.

If it’s a new gun it should be under warranty you can call the company and see what they will do. PJ

Answer

PJ covered it pretty thoroughly. 🙂

While I would think it is the cartridge stops, if the lifter isn’t working properly the cartridge stops may not be the issue. But the Mossberg pumps are easy to watch the cycling on and see.

I had an issue with a Maverick 88 where I called Mossberg for info and parts and they simply sent me parts in the mail at no charge. It’s always worth calling the manufacturer on newer guns. Customers love it when you tell them you got some free parts for them. 🙂 Jeff

Answer

Like the other posts mention watch the shells and the cartridge stops and the lifter as you work the action. Make sure both cartridge stops engage the correct amount and engage the shells when they should. Don’t forget to make sure the face of the cartridge stops are positive. Ken

Reply

Thanks for all of the replies, Fellas! I removed approx. 0.004 to 0.005 from the right side cartridge stop and all is well. Now there IS some play when both stops are activated(just a few thousandths) I took the material off with a file and touched it up with a stone, problem solved.