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I have a model 12 made in 1950 that has a aftermarket barrel on it. I purchased a factory barrel made in 1947 and I want to swap barrels. How do I get the Receiver Extension off of the barrel? Is it just a matter of putting it in a barrel vice and turning it off or do I need a special tool?
 

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Your first problem would be to unscrew the extension without damage, and then fit it to the new barrel, but the bead has to be on top, so lathe work is almost a given.
Then it needs to have the fit into the frame made proper, and the adjusting sleeve that you have will probably not work right, either.
Then you need to make sure that the barrel chamber aligns with the specially mated chamber ring that we hope hasn't been overly cut large or offset to fit the aftermarket barrel, or else you need one of those to be fit, also.

Parts possibly needed: adjusting sleeve, chamber ring
Tools possibly needed: chamber ring fitting set
Tools almost certainly needed: barrel extension wrench, lathe

Experience is necessary to minimize the possibility of ruination of something, and lucky amateurs will have a loose barrel and/or one that doesn't extract, and may feed with difficulty with a mis-aligned chamber.

Yes, I am a Model-12 specialist, and have plenty of spare parts.

Right now I have just posted a Black Diamond Model-12 for parts salvage, but if someone wants to get the complete set, realize that the frame has been battered to the point of being useless without a rebuild. This has very nice figure in the wood and a solid rib 30" full barrel.
I would rather fit all of the parts to a replacement frame from the Nickel Steel era, and use the matching extension that hopefully was with the frame.

http://www.trapshooters.com/noframes/cf ... messages=3

There are the pictures and some details, if you care to see.

[email protected]
 

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The problem with fitting these barrels is the variable nature of the problems that may arise, from the barrel being extra-tight on the extension to the misalignment of the chamber possibly making the chamber ring replacement recommended.
Figure that removal from the extension and fitting the new barrel to the extension, plus fitting to the frame, is all that is typically needed, if the adjusting sleeve is usable. A different sleeve or refit of the original sleeve will add some expense. If the chamber has poor alignment with the chamber ring, mating the two together to a minimal level and test-firing with several types of shells will verify that none stick. That will be considerably less than doing a chamber ring replacement, since chamber ring cost and fitting can double the expense of barrel swap. This is seldom necessary, but you wanted to know the possibilities.
I can tell pretty closely if there is going to be a misalignment problem with a simple examination, just so I have the parts here to compare, then I can let you know. I will do what I can to minimize the possibility of problems.
I would rather you know what is wrong or not so you don't have to make a blanket decision before starting.
Are there any other details you need to know?

[email protected]
Check my previous postings for more gunsmithing information.
 

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Kirby, I'm going to buy a M-12 barrel from Corson's that already has the extension on it. Will that barrel/extension fit easily on my current M-12 or will it require endless adjustments to make it fit. I have the huge original "Gunsmith" manual, but I was just wondering if you think it'll fit as is.

BT
 

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A Model-12 barrel should not be expected to just drop in place, and one that does happen to get close to snug with the adjusting ring that may be present should be considered as a fortunate coincidence.

The chamber alignment will be another part of the equation that needs to be verified as not being too far off to allow proper shell fit for the feed and extraction cycles.

The barrel will probably need to be fit to the frame but doesn't require fitting to the extension like the original posting subject. A shooter gun doesn't necessarily need matching numbers on the extension, and there may not be numbers present on a few barrel extensions out there. Numbers were typically stamped at the factory and service centers when installing a replacement or extra barrel.

Proper fitting of the barrel will be best accomplished with the tools mentioned, so if you want a proper fit, give me a call or speak to another Winchester experienced gunsmith that has the same tools available.

Once you have the barrel fit, enjoy your piece of classic iron.

[email protected]
Model-12 specialist gunsmith
 
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