troubleshoot a mossberg 590?

utaherrn · March 26, 2005, 03:48 AM

While cycling the action open, the round in the tube will occasionally fail to eject into the action. It will eject out the bottom of the loading port when the action is being closed though.
Opening the action more forcefully doesn't make any difference, and a thorough cleaning hasn't helped either.
I will begin to close the action a couple of inches and smack it open again and the round usually pops into the action at that point.

Any ideas? Thanks.

HSMITH · March 26, 2005, 10:17 AM

There are two thin strips of steel in the sides of the receiver with the tips bent out to stop the shells from being ejected on the elevator until the correct time. They are called 'shell stops'. The first one stops the shell during firing, the second one stops the shell until the action is fully opened. For some reason one of these is hanging up, probably crud behind it. Take a can of brake cleaner/gunscrubber and blast out behind them. Put some dummy rounds or snap caps in and watch what happens when the action is cycled, you will be able to see which one is causing the problem.

utaherrn · March 26, 2005, 03:18 PM

I thought I cleaned out behind those, and it was a little better after doing it, but I'll try that again.

utaherrn · April 1, 2005, 01:49 AM

did what you recommended, runs great now, thanks much.

HSMITH · April 1, 2005, 10:43 AM

You are welcome. Glad it worked.

March 26, 2005, 03:48 AM	#1
utaherrn Senior Member Join Date: March 16, 2005 Location: Happy Valley, USA Posts: 649	troubleshoot a mossberg 590? While cycling the action open, the round in the tube will occasionally fail to eject into the action. It will eject out the bottom of the loading port when the action is being closed though. Opening the action more forcefully doesn't make any difference, and a thorough cleaning hasn't helped either. I will begin to close the action a couple of inches and smack it open again and the round usually pops into the action at that point. Any ideas? Thanks.

March 26, 2005, 03:18 PM	#3
utaherrn Senior Member Join Date: March 16, 2005 Location: Happy Valley, USA Posts: 649	thanks I thought I cleaned out behind those, and it was a little better after doing it, but I'll try that again.

April 1, 2005, 01:49 AM	#4
utaherrn Senior Member Join Date: March 16, 2005 Location: Happy Valley, USA Posts: 649	hey HSMITH, did what you recommended, runs great now, thanks much.

March 26, 2005, 10:17 AM	#2
HSMITH Senior Member Join Date: June 21, 2002 Posts: 2,019	There are two thin strips of steel in the sides of the receiver with the tips bent out to stop the shells from being ejected on the elevator until the correct time. They are called 'shell stops'. The first one stops the shell during firing, the second one stops the shell until the action is fully opened. For some reason one of these is hanging up, probably crud behind it. Take a can of brake cleaner/gunscrubber and blast out behind them. Put some dummy rounds or snap caps in and watch what happens when the action is cycled, you will be able to see which one is causing the problem.

April 1, 2005, 10:43 AM	#5
HSMITH Senior Member Join Date: June 21, 2002 Posts: 2,019	You are welcome. Glad it worked.