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help me understand

Discussion in 'Rifle Country' started by yotesmoker, Jan 27, 2012.

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  1. yotesmoker

    yotesmoker Member

    Jun 11, 2006
    pa mountains
    what is ment when measureing the bbl of a m1 carbine by the numbers 1,0.....2.0 or something lile that.what is being used when measureing the bore.What are good and bad numbers?
  2. Kevin5098

    Kevin5098 Member

    Dec 21, 2008
    The number is the wear at the muzzle in thousandths of an inch over .300. Usually measured with a muzzle wear gauge inserted in the muzzle. Google "muzzle wear gauge" for more info.

    As a guide, 0 would be the ideal number for a brand new barrel. By the time the barrel reads three it has considerable wear.
    Last edited: Jan 27, 2012
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