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M1 garand bore guaging

j0n0
Are specific guages available for checking 30-06 muzzle wear? For you old hands, this is likely a poor question, but putting an M2 round into the muzzle and measuring the amount of projectile extending seems somewhat haphazard. Is there a better method for folks new to the M1 to get a good idea of barrel diameter? I know CMP says to look for barrels with the throat and muzzle wear to be no more than 2, but what is the test or tool to be sure? Do you machine an aluminum dowel to 7.62 or create a cone that starts at 7.62 and gradually increases diamater? Is such a tool available? Can it be used on the muzzle as well as the throat?

This is likely a question that has been answered hundreds of times so I'm sorry I didn't see the link to the answer in my searches.

Anyhow, thanks in advance for your help.
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Comments

7 comments

Date Votes
  • mark christian
    There are indeed specific tools and they often look like this:
    [img][/img]100_1115.jpg
    The top gauge is used to check muzzle wear (MW) and the lower to check for throat erosion (TE). Uncle Sam considered any barrel with TE of under 6 and a MW under3 to be serviceable and ready for issue. Readings above 6 and 3 meant that a barrel change was mandated. Decent shooting results are often seen with on barrels with TE as high as 8, but those barrels are nearly at the end of their lives and a barrel change is coming sooner rather than later. Muzzle wear above 3 typically leads to poor accuracy no matter what the throat reading might be.

    Here is an example of a barrel completely shot out on both ends:
    [img][/img]00M1BR3.jpg
    This is about a TE of 9
    [img][/img]00M1BR4.jpg
    Notice how the muzzle is so worn that the MW gauge actually goes into the barrel's muzzle so deep that it is beyond the built in stop at level 3 and nearly reaches the knurling intended to allow you to grasp the gauge? That probably rates a MW of 5!
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  • Ambrose
    mark: Great explaination and pictures! The only thing left out is where one can obtain these gauges.
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  • Don McManus
    quote:Originally posted by Ambrose
    mark: Great explaination and pictures! The only thing left out is where one can obtain these gauges.

    Fulton Armory shows them in stock:

    http://www.fulton-armory.com/MParts.htm

    $ 34.95 for the Muzzle Gauge.

    $ 79.95 for the Throat Gauge.

    (Scroll down, the listing is alphabetical)
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  • nmyers
    But, most folks don't need that much precision. The "poor man's MW gauge" works fine for me; USGI M2 ball is made to pretty tight specs.

    Neal
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  • dcs shooters
    CMP has both guages also.
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  • mark christian
    I received and e-mal from a fellow wanting to know just how deep into the barrel that muzzle gauge went. These photos give a good idea of how far into the muzzle of the barrel a reading off the scale is:
    [img][/img]00M1BR4.jpg
    Here is the gauge shown outside the barrel showing the depth it went into the muzzle. It is getting darned close to the gas port!
    [img][/img]00M1BR5.jpg

    This worn out barrel actually had no pitting, very little frosting and the rifling was fairly strong. This is why at a gun show a quick look down the bore with a flash light really tells you nothing useful
    about the condition of the barrel.
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  • Emmett Dunham
    Stone Ax is the guage that most people use that frequent the CMP forum not the ones listed here. The problem is that the maker does not have a web site and take mail order only. Try a search for his mailing info or post on CMP forum for it he will send a brochure. The price is good!
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