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Old 01-13-2019, 9:38 AM
Starslinger Starslinger is online now
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Default How to remove constriction from end of shotgun magazine tube

It appears that the magazine tube in my Browning BPS shotgun is designed with a slight constriction at the far end to help retain the follower. This constriction is preventing me from using a +2 mag tube extension. Once four shells are loaded into the magazine, the follower stops at the constriction instead of being pushed into the tube extension by the fifth shell. Even with the mag tube spring out and my finger resting on part of the follower, I cannot pull the follower past the constriction.

I think this constriction is very minor. If I could just widen it a tiny bit I bet the follower would pass through. I read an old post on a forum where someone used a brass plum bob and a hammer to widen this constriction, but I'm wary of damaging my shotgun using that method. Does anyone have a clever DIY suggestion or will I need to take the gun in to a local gunsmith?

Thanks for any advice!
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Old 01-13-2019, 10:21 AM
shafferds shafferds is offline
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There is a tool you tap into the end of the mag tube the expands the tube to get rid of the bumPs on mossberg and remington shotguns. I also know people have use dremels with sanding disc or files to remove the bumps.
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Old 01-13-2019, 10:03 PM
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saki302 saki302 is offline
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Are you near Van Nuys?

I would bet Randall (ar15barrels) has the proper tool for doing this.
The tool to press dents out of shotgun barrels would also work nicely.
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Old 01-13-2019, 10:05 PM
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Mesa Defense Mesa Defense is online now
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Dremel tool?
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Old 01-14-2019, 9:37 PM
Starslinger Starslinger is online now
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A local gunsmith told me the magazine tube was crimped at the end to retain the follower and the magazine spring retention ring. He fixed this for me using a swedge, which apparently is a tool that widens the ends of pipes.
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Old 01-15-2019, 10:51 AM
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ar15barrels ar15barrels is offline
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I have made a swaging rod that I slide in and then you peen the outside of the tube until the swage frees up.

The ghetto method is to find a socket that slips snugly into the tube and do the same thing with it.
Randall Rausch

AR work:
Bolt actions:
Foreign Semi Autos:
Glock, XD and M&P pistols, Benelli and Remington shotguns: barrel, sight, trigger and receiver work.
Most work performed while-you-wait, evening and weekend appointments available.
Founding member of the CAPRC
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