Marine Magnum mag extension coupling potential issues

Remington 870 Repair and Gunsmithing.
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wolf77
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Marine Magnum mag extension coupling potential issues

Post by wolf77 » Thu Jul 26, 2018 10:32 am

Hi gents,

I own a 1994 Marine Magnum, and upon previous disassembly I have noticed that the bottom end inside of the mag extension coupling has a rather deep indentation all accross its radius - probably created over the years by the "click-ing" contact with the ball bearing at the edge of the barrel contact ring.

I just want to know if this wear and tear situation could pose a problem to the overall functioning of the shotgun and if should it require a new mag coupling. Note I have never fired it before.

I hope I was accurate in my description.

Thank you for all your help.

Alex

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Scorpion8
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Re: Marine Magnum mag extension coupling potential issues

Post by Scorpion8 » Fri Jul 27, 2018 3:27 pm

A couple detailed close up photos may help.
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wolf77
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Posts: 10
Joined: Fri Nov 01, 2013 8:26 am
Location: Bucharest, Romania

Re: Marine Magnum mag extension coupling potential issues

Post by wolf77 » Fri Jul 27, 2018 4:34 pm

Hi there,

Unfortunately, I cannot upload photos on the forum, probably newbies are not allowed. I have provided a description of the issue on the general discussion section.

Any chance I could make the photos visible here? Maybe if I ask the admins...it does not work, neither by adding files nor by drag and drop...

Cheers,

Alex

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Synchronizor
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Re: Marine Magnum mag extension coupling potential issues

Post by Synchronizor » Wed Sep 05, 2018 5:04 am

The coupling nut isn't made of particularly hard metal, and wear to the detent notches isn't unusual. Mine got pretty gacked-up when I tightened it onto a sling plate with a staked in detent ball:

Image

It still works fine, though.

I wouldn't worry about yours unless your extension is backing off under recoil, and even then, it's probably not the nut's fault, since the extension bracket on the factory two-piece extensions can hold everything together even if the kits are installed on barrels without mag cap detents.

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