Quoted:
1. You will need a larger than normal for .30/06 gas port, Not going to say exactly what size because every rifle seems to vary a little bit, start a few thousands oversize and work up until you find a range where the rifle runs.

Quoted:

I'm very interested in getting a 308 Garand as I have a fair amount of 7.62 Nato spec ammo on hand. I had one made by a well known vendor but I could never get it to run right so I ended up sending it back. I noted that Fulton Armory is having a sale on them and thought I would ask the group: Does anyone have a FA 308 Garand and what do you think of it?



Thanks

M1 Garand 7.62x 51 Gas Port Hole Size

I need some help with My Garand chambered in 7.62x51.
The case will not eject at all.
I have been told that the gas port needs to be opened up.
It is .093 diameter now does anyone know what size it should be ?



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.094" is for 308... at least that is what a Citadel barrel is that I have as well as my Kreiger barrel on my Match 308 Garand..


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1. Who manufactured the barrel?
2. Is headspace correct and chamber well polished?
3. Precisely what ammo are you using?
4. Has piston been examined and measured or gauged?
5. Has gas cylinder been examined and gauged?
6. Is the gas cylinder a snug fit on the barrel to minimize gas blowby?
7. Is op rod spring a recent good quality replacement?
8. Is the cam inside the op rod handle burred or deformed?
9. Is the rifle properly lubed with good grease?
Do not enlarge gas port until/unless all other remedies fail.
As I have often stated, if it is difficult to extract an unfired cartridge it is a strong indication that the ammo is too long for the chamber. That can be caused by a chamber that is not fully reamed to establish correct headspace; or it can be caused by using foreign military surplus ammo––much of which is too long for U.S. chambers.
Most functioning problems with an M1 can have various causes or combinations of causes. There is no good substitute for having the rifle in hand to thoroughly examine and test; but often, with sufficient information, corrective measures can be recommended by communications alone. When only minimal information is provided by the one seeking assistance only guesses can be provided.
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Tip: Barrel Gas Port for .308 M1 Garand
From: Gus Fisher
EMAIL:
Date: 18 May 1999
Time: 11:07:33
Comments
Most of the standard replacement .308 barrels seem to have a gas port hole size around .080", which is correct for .30-06, but NOT for .308.
The issue 7.62mm barrel had a gas port size of .106." This hole size is actually larger than required. I find the Number Drill bit that will give you a .096" hole is plenty. Some people like .100", but I've never found that to be required as long as the ammo falls in spec with military ball or Federal American Eagle or Premium Ammo.
I spend a LOT of time aligning the hole in the drill press to ensure the larger sized drill bit will go down through the center of the hole. It helps that the path of least resistance for the larger drill bit will pretty much keep it centered when you drill it. Any metal burrs, that result from the drilling, get smoothed out after 10 to 20 rounds.
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If the gas port is the correct size, then check the gas piston and the gas cylinder for wear. The gas piston should be approx. .526" in diameter, and the interior of the gas cylinder should be approx. .532". A cheap gauge to check the gas cylinder is a belted magnum case. The diameter of a belted magnum rim is .532". A piston too small, or a gas cylinder too large will allow too much gas to escape and cause short stroking.

By Sailorman2 (M14tfl.com)
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