View Full Version : Disassemble Mossberg 500 A

Nick S.
May 31, 2012, 08:16 PM
The trigger assembly won't come out after I removed the pin. Do I have to remove the butt stock first? I don't have a pistol grip. It's a regular old wooden stock. I've watched several videos on the 500 and it comes right out. The only video I found on the 500 A had a pistol grip and that's why he said the stock had to be removed.

June 1, 2012, 12:38 AM
Buttstock is always first. Than the trigger should be able to be pulled up.

June 1, 2012, 01:15 AM
You don't have to remove the buttstock on a 500 to field strip it. After you take the trigger assembly pin out the trigger assembly should pretty much just fall out. Mine's the old wood stock and I just did it to make sure. ;)

June 1, 2012, 02:04 AM
Well if its new yes. My 590a1 and my friend 500 wouldn't come out unless we took out the buttstocks. If youve worn it in enough it wouldn;t block the trigger set.

June 1, 2012, 06:33 AM
i have a new 590a1 and no need to take the butt off, only if its a straight pistol grip to my knowledge. Just give a tug from the butt end of the trigger group up and back and should come out.

June 1, 2012, 07:19 AM
Buttstock bolt needs a washer or 2 or carefully shortened on a grinder as it is binding up on trigger housing so needs relieved anyway as that is not part of the planned design...


June 1, 2012, 07:21 AM
Will only get worse as gun "wears in" as bolt head will dent in the stock as well as bolt will stretch a tiny bit being soft metal and so long...


Nick S.
June 1, 2012, 03:16 PM
UnbearablePanda was right. Maybe that's the difference between the 500 and the 500a. It came right out, no problem after I completely removed the stock. As I gradually loosened it, the housing got looser & looser but wouldn't come out until removed. There were already 2 washers under the bolt head. I tried adding a 3rd & put it all back together but nothing changed. Then I put it back together without the trigger assem. & looked at the threaded part where the bolt threads in. It was shy of even coming flush by a few threads. So I removed the 3rd washer & reassem it again to retain full thread contact into the receiver. I think the situation is that the rear,rounded tang on the trig/assem fits so tight in the stock, that there's no swing room for it to lift out. The front edge of the trig/assem hooks into the receiver so the rear must swing in an arc as it's lifted. The only other way to change things would be to file away a clearance angle on the tang which might weaken the perfect fit it now has. I want to thank everyone for all the tips. After today I feel like I could take it apart & back together blindfolded.

June 1, 2012, 03:31 PM
try raking the forend back half way the trigger group should lift out

Nick S.
June 1, 2012, 03:45 PM
I'm not sure what you mean. That front edge was hooked in pretty good. I tried forcing it back enough to slip out but I couldn't do it without feeling like something might break. It's only plastic.

June 2, 2012, 12:29 AM
Had the exact same problem not too long ago actually :rolleyes: Called up a friend with a 500. Said he just removed the stock first and I had to facepalm myself for not noticing. The internals are freaking amazingly easy to put in and out after the first time :D.I wouldn;t cut anything or even try to sand it down. When my ATI Pro stock came in it stated that it shouldn't be pushed together. Leave a tiny bit room left together within the holding spaces. Guns are expensive, don't damage anything!

June 2, 2012, 07:11 AM
One more time... the stock bolt is BINDING and SHOULD NOT be hitting the trigger group... Over torquing is usual cause.... even from the factory.


June 2, 2012, 02:33 PM
It doesn't seem like it...... Even with my ATI stock it wont come out without removing it. Since it is touching the trigger group. I really don't see how, plus the original stock was REALLY easy to come out. So how does that make it over tightened?

Nick S.
June 3, 2012, 05:13 PM
Hotdogs,as I said, when I put the stock back without the trigger group & looked at the place where the stock bolt threads in, it wasn't protruding at all. The stock just presses in & captures the rounded tang very tightly.