Grandsons Garand

[Dan Shapiro]

Checking Kuhnhausen, gas ports for 30-06 barrels according to specs: .0790"+.0015". Ports should be no larger than .0810".
a #47 (.0785") drill shank can be used as a cleanout tool. A #46 (.0810") drill shank can be used as a max gauge.

[gunner312]

Appears that the gas port is small. .077-, so I'll take it out to .079, reamer ordered today. (also a .080+ reamer)

thanks for all the help & advise.

Jim Wright
(Gunner312)

[dryheat]

ME of three isn't all that great. .308 barrels get the gas port reamed out to .093- Don't worry about the gas cylinder lining up with the gas port...it does.
The tit test just fine tunes the rifles for match shooting...it won't stop an oprod from cycling unless there's part of a limb in the way.

[RIPCORD2]

Just an Idea, but have you checked the alignment to make sure the opening in the barrel and gas cylinder are even so the gas cylinder is not restricting the gas flow?
just a thought.-hope this helps --RIPCORD2