Remington Model 12

Binrat1978

Binrat1978

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Hi, I have a Remington Model 12 in 22lr. I have replaced the firing pin and extractor, but there is an issue when firing. It seems that the round does not completely chamber for some reason. I can close the action and fire it though. I am almost thinking that the chamber has been worn down as the base of the cartridge has bulging which results in the casing getting stuck in the chamber.

Am I right in thinking the chamber needs replacement? Is it even possible to do this or is this now a parts gun?
 
The bulging of the brass is either from it being unsupported or a pitted area of the chamber. Is the rifle chambered for 22 LR? It could have been shot with a lot of 22 Short which had a tendency to erode the forward area of the LR chamber especially if it was an early one. Barrel can be set back and the chamber re-cut if the rifle is a worthy candidate otherwise.
 
It is also possible to counterbore the old chamber and install a sleeve.
I've never done that, mostly because I've always just found it simpler to reline the entire barrel.
Also, the chamber hasn't been the issue for me, it has always been the bore.
 
Years ago, I inherited a Rem 12 from my uncle. It had been shot a lot. The first time I shot it, there was a puff of smoke, and the pullet spit out of the barrel about 30 ft. The extracted case was split lengthwise. The chamber was worn oversize from the numerous rounds fired. Not surprising as these guns were made with relatively mild steel.
 
I have an early REM model 12 that I bought at the Calgary gun show about 40 years ago. It also had a poor chamber (likely from shooting shorts as was suggested) that the empty shells would hang up. I just relined the barrel. Fixed the chamber and now has a mint bore.
 
Have you looked at the chamber with a borescope ? A possibility is that it's got a Carbon ring from shooting shorts and will not allow LR to fully chamber. That could be causing the 'bulging', too. Just a guess . . . quite common for rifles that have been cleaned to an 'old standard' with Hoppes, etc. When I got a borescope I was amazed at how poorly I had been diligently 'cleaning' my 22s. PS - That 'ring' may not show up by just looking at the chamber from the back end.
 
If the firing pin is striking the barrel it can create a burr, this can chambering and extraction issues. Swaging the chamber is a place to start.

The firing pin itself may need fit, especially if aftermarket.

Clean the chamber well, also any cuts in the barrel where the extractor may fit.
 
If the problem is in the chamber, lining the barrel would cure the problem and give a brand new bore as well.
Or, if the original bore is fine, just the chamber area could be lined and a new chamber cut.
If the breech is locking shut normally, the round should be seating fully, unless, for some reason the bolt has been set back. I suppose there could be enough bolt/receiver wear to greatly increase headspace.
 
Thanks for all the replies. I got the rifle from an old guy in Alberta last year. It likely has been shot with a lot of 22 short. Wouldn't a bore brush clean a carbon ring out though? I have noticed some Remington 12 parts rifles for sale but I am not sure if the chamber is a separate piece from the barrel. I plan to sell this but not if it becomes a money pit rifle, lol.
 
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