M1 Carbine Re-chamber

bearhunter said:
JEC, want better accuracy from a rifle that was never designed to deliver more than 4-6 inches at 100 yards and you need to do more than just rechamber it.

You need to take a look at why the system is not accurate in the first place. I am working on a M1 Carbine at present that has a 22in match grade heavy Shilen take off barrel installed. Compared to most M1 Carbines it is a tack driver. Can more be achieved from it??? Likely. Is the little bit more worth the effort? Not likely. Also, what will the cost be??? Prohibitive at best IMHO.

I'm only doing what I am because I had the parts on hand and the tools to do the job. If I had to pay to have it done and I really wanted a 300 Black Out, I would look at converting a Mini 30 or getting an AR system rifle that was built to handle it. The overall length of the 300BO is to long for the mag IMHO of the 30 M1 Carbine.
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You sound like a very interesting man.

There is a rumour that the .22spitfire 5.7johnson, is going to be making a comeback.
My guess is in one of the new Inland carbines.
 
case length many be too long to run it the carbine, not to mention pressures and velocity are far differn't, I think I looked at this no paper and did a pass on it.

as bearhunter has said the dynamics of the tolk round match the Carbine much better, I am actually part way through this exact mod, just getting around to pushing out the bolt face and adjusting the extractor.

think I can make a mag well adaptor that wound take the tolk mags too to get 8-9 round count.

bearhunter - were there significant changes needed in the gas port/ op spring / slide weight, ratios to get reliable function?

G



bearhunter said:
I can tell you from personal experience, you gain nothing by bedding an M1 Carbine receiver. You also gain nothing by bedding the barrel. The real big question is how do you extend the mags and open up the receiver to feed the new round?

I made one up in 7.62x25 and it worked well. However it required opening up the bolt face and very carefully reshaping the extractor with judicious grinding. The Chinese converted quite a few of them if rumor is true. I did manage to look at one in Lever Arms that came in with a batch of worn and beaten M1 Carbines a few years back that were supposedly out of China. That gave me an idea of what needed to be done.

The 7.62 x 25 round is typically loaded to much lower pressures and other expedients are needed to get the rifle to chamber and eject reliably. Another issue is the cartridge OAL is shorter than the 30 Carb round. If you are going to attempt this particular conversion you will find the mags hold and feed pretty well. You will also find that the feed ramp on the receiver will need to be honed and slightly reshaped. This is not a straight forward action to be converted. It was pretty much specifically designed for its intended purpose/cartridge.

Anything is possible thought within reason and the capabilities of the receiver/bolt/gas system/op rod etc. Be sure you have the patience/time/tools etc to take on such a project.
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Beretta Armorer said:
case length many be too long to run it the carbine, not to mention pressures and velocity are far differn't, I think I looked at this no paper and did a pass on it.

as bearhunter has said the dynamics of the tolk round match the Carbine much better, I am actually part way through this exact mod, just getting around to pushing out the bolt face and adjusting the extractor.

think I can make a mag well adaptor that wound take the tolk mags too to get 8-9 round count.

bearhunter - were there significant changes needed in the gas port/ op spring / slide weight, ratios to get reliable function?

G
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The gas port was opened a few thousandths but whether it was necessary or not is debatable. I played with the recoil/return spring length but in the end only removed a few rings. The 7.62x25 generates quite a bit of pressure and gas. The Chinese converted a lot of them as I said. The rifle I saw at Lever Arms used the same issue M1 mag. It would take some fiddling to get a Tok mag to work because you would also have to change the feed ramp on the receiver.
 
The fact that most(all?) the 7.62x25 we have access to is corrosive, I am not quick to accept it as a preferable to the standard cartridge.
 
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