590 safety not functioning.

EL34/6L6

EL34/6L6

CGN Ultra frequent flyer
Rating - 100%
24   0   0
Location
WPG
Ran into a problem yesterday.

My 590s safety will not return fully to the safe position.

I've had the gun apart multiple times over the last 24 hrs, and it seems that:

If I reinstall the safety in the safe position, then reassemble, the safety is locked in safe position.

If I install the safety the fire position, then reassemble, the gun fires but will not completely return to safe mode. It stops short of covering the red dot and still fires.

Note:
Safety moves freely in both directions upon install, but as soon as the trigger group is reinstalled the above problems reoccurr.

Something is inhibiting the travel of the safety. I suspect it's the small metal piece at the rear of the trigger assembly that sticks straight up. Any insight?
 
It could be the safety block hanging up on the bolt. My suggestion is put the bolt fully rearward into battery and then remove the safety switch to see if you can find any interference. Keep the bolt rearward when you reinstall it.
 
That's my suspicion Juan, I can see contact wear on the protruding trigger piece that indicates some kind of contact. It's just really hard to see with the bolt rearward.
 
When I replaced my safety with an oversized one, I almost installed the inner cam backwards.
Had to watch a YouTube video to see which way it went back on. Doh!
 
I don't have a clue but doing some research for you and found this, might be of help:

I took the gun apart and cleaned the heck out of the trigger guard, receiver, and especially the safety area. There was a lot of gunk. So I hoped that would fix it. I examined how the parts move inside the receiver. I reassembled and worked the slide forcefully. When the slide was worked hard something was hitting the safety and moving it an eight of an inch on safe. I shot about 30 rounds at the match and then it started switching on occasionally. I tried to run the pump surely but not to hard to minimize the auto safety. This worked 90 percent. I was disappointed still.

I examined the safety and here is a discussion of how it works. On the trigger group there is a small stud that sticks straight up. On the frame there L shaped piece of metal. The long portion of the L has a c crook in it. The short portion rides in a slot in the frame. That L piece is held up in the frame by a screw through the button on the outside. There are two holes in the bottom of the button. A ball bearing is pushed up into one of the two holes by a spring and keeps the safety in the selected position. When the safety is on the L shaped piece of metal sits over the stud in the trigger group and prevents the trigger from being pulled. When the safety is off the stud is unhindered and the trigger can pull to let the hammer go.

If you are at all unsure about doing this work. STOP and do not perform this work. This is not for amateurs. This is an advanced task. Take it to a gunsmith. Send it to the factory.
I examined the wear marks and determined that I could remove some metal from this point and not affect the safety operation or strength of this piece. On the short end of the L that rides in the frame, I put a slight bevel on the front edge of the safety. Please understand that this is not the piece that stops the stud from moving. This is the piece closest to the back of the bolt. I used a tiny pair of vise grips and a 1” belt sander to remove a small amount of metal from the front edge. I put the parts back together and racked the crap out of the slide and the safety would not move no matter how many times I worked the action. I took it out and test fired the shotgun with slugs, military buckshot, and Birdshot. Problem solved. After not finding answers on the internet I decided to take the time and post my problem and the fix I found to help out the next guy.
Click to expand...

index.php


index.php


 
Last edited:
Thanks, it does seem that the trigger group is impeding the function because the safety travels freely until the trigger is reinstalled.

I've had it apart multiple times and right now am sick of stripping and reassembling the entire gun.

Strange, cause I've never heard of this before, and now I'm reading lots of issues with the Mossberg safety being engaged under recoil and stuck from the bolt hitting it during hard cycling.
 
Last edited:
This protruding metal piece on the trigger assembly is hanging up the safety block.



Seems that when I fully seat the trigger group it impedes the blocks full travel.



Safety block in full rear position.



If I stop short of fully seating the trigger group the safety moves freely, then as soon as I push the group in its final few millimeters the the safety block there is contact with the block causing the safety to not be able to slide fully back.

Not sure about warranty, its about 2 years old. Approx. 200 rounds.
I've heard Mossberg warranty service is pretty brutal. Your also gets trashed during the whole process, especially the parkerized finish.
 
I don't know, looks normal to me. The trigger functions normally otherwise. Gun fires, just no safety.
Did you remove the side cover plate on the group?
 
In your photo it appears as if the tab that engages the safety tang isn't parallel with the top edge of the trigger housing.
Might be an optical illusion...maybe position your trigger group in the same position as my photo to compare?
No side cover removed...this is the Mossberg plastic trigger group I just replaced.
Here is a brighter shot of mine, in a similar position as your first photo:
View attachment 31699
 
Last edited:
OK I'll remove it again and compare the two areas.

** Looked at it again and it looks the same. No anomalies.
 
Last edited:
juancarlos said:
Hmmm, did you put an aftermarket screw into the safety. Maybe it's too long and thus interfering. Hard to tell from the inside angle.
Click to expand...
Yes im using an aftermarket hex screw, and it does stick out into the block a few threads or so. But I honestly cant remeber if the original one did too or not. Im also not sure if full clearance is required there or if it could be the hang up point because once the trigger goes in all visuals are lost.
I will look at backing the screw out a bit and see if it helps. Thanks.
 
You must log in or register to reply here.
Back
Top Bottom