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Old October 4th, 2020, 01:21 PM #1
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Western Field 20 ga shotgun issue

I have an old 20ga Western Field (lower grade Moss 500 clone) in excellent condition. Only bummer is that the slide fails to unlock after firing, so I have to manually press the slide unlock botton between shots. What would cause the slide to not unlock? I disassembled it and everything looks normal.

Only weird thing is that one of the cartridge interrupters says “12 ga” on it and this is a 20 ga gun. I wouldn’t think this had anything to do with it though.

The trigger group looks normal, no broken springs or anything, and the slide unlock lever moves freely when manually manipulated.
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Old October 5th, 2020, 09:35 AM #2
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i like to check gunparts.com sometimes the schematics are helpful
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Old October 5th, 2020, 09:14 PM #3
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It should be a private label Mossberg 500 and should take the same parts.

Ray

Last edited by m1carbine; October 6th, 2020 at 06:44 PM.
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Old October 6th, 2020, 03:10 AM #4
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Old October 6th, 2020, 06:50 PM #5
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Gun parts corp has a private label cross-reference list that you can look the old private label guns on.

https://www.gunpartscorp.com/brand-cross-reference

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Old October 6th, 2020, 06:57 PM #6
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I recently sold a Westernfield 550...it was a Mossberg 500 in all ways outside of the magazine tube was slightly different but interchangeable with later Mossberg tubes...and the trigger group was all plastic and Mossberg eventually added some steel reinforcement where the part rotates into and snaps into the receiver.

Replacement parts should be easy to source.
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Old October 7th, 2020, 11:06 PM #7
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Just picking nits, but I believe that is the cartridge stop pictured and not the cartridge interrupter. Looking at parts at Mossberg.com, it appears that the 12 & 20 ga use the same piece.

https://www.mossberg.com/store/cartr...-101694bl.html

This video might shed some light on your issue. Good luck!

https://youtu.be/4ssJY1bBFGk
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Old October 8th, 2020, 12:07 AM #8
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Try holding the slide forward when you shoot.
Look for a burr or groove on the rear of the bolt or slide where the release lever rests.
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Old October 21st, 2020, 10:15 PM #9
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Any luck?
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