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M1 Carbine gas port

This is a discussion on M1 Carbine gas port within the Gunsmithing forums, part of the M14 M1A Forum category; Is it feasible to enlarge the .070 gas port on an M1 carbine barrel to improve its marginal operation without creating safety or other reliability ...


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Old August 23rd, 2013, 12:41 PM   #1
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M1 Carbine gas port

Is it feasible to enlarge the .070 gas port on an M1 carbine barrel to improve its marginal operation without creating safety or other reliability issues?

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Old August 23rd, 2013, 01:27 PM   #2
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It probably wouldn't be a good idea. The Carbine is designed to operate at the maximum pressures generated by it's cartridge. Failures during development were common. Increased gas pressure in the cylinder causes the excessive stress on the bolt and operating system. It also causes an increase in bolt velocity while decreasing dwell time. This allows the bolt to begin extraction early while the cartridge case hasn't been given a chance to shrink back closer to it's normal size. the result would be stuck cases and ripped off rims.

Most Carbine functioning failures are caused by old and worn parts and springs. Altering the gas port should be the last resort and avoided. It's possible to get away with enlarging the gas port in a Garand or M14, but never in a Carbine.

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Old August 25th, 2013, 05:43 PM   #3
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Thank you for the reply.

I am familiar with the Garand barrels having different size gas ports depending on caliber and the use of adjustable gas plugs. Also Mini 14s, with a somewhat similar action, using different size gas bushings and adjustable gas blocks also.

The above is what got me thinking has something similar been tried with the M1 carbine. Never heard that it been done before so thought I had better ask first.

Thanks again.

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Old August 26th, 2013, 05:01 AM   #4
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M1 carbine gas port

If you are having cycling issue I have two suggestions.
1) A carbon ring can form in the rear of the chamber.
Use a bore mop soaked in hoppes and let it sit in the chamber overnight.
Then hit it with a good bronze brush.
2) The slide (oprod) spring hole in the receiver can get full of hardened grease. Clean the hole like you would clean the bore (solvent & brush). Then use light oil (not grease) on the spring.

JMHO

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