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Old May 11, 2019, 04:19 PM   #26
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What was the ME and TE?

ME (Muzzle Erosion)
TE Throat Erosion

The ME and TE numbers are derived using a gauge. There are a variety of gauges available from various manufacturers. When a CMP rifle ships they include the gauge readings for the muzzle and throat of the rifle you get. Here is one such example and explanation: The Infamous Throat Erosion Gage.

Never mind, being slow on the uptake I figured out you wanted the actual numbers. Duh!

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Old May 12, 2019, 09:18 AM   #27
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lunger: If asking about my special, Has new barrel. So zero and zero.
Your new Criterion barrel will for sure not disappoint, provided you hold up your end of the marksmanship equation. Remember, 'it's the singer, not the song.'

That said, experienced M1-users will tell you that of the three criteria for judging what might be called the 'shoot-ability' of a CMP USGI barrel - TE, ME, and MW - the last two are by far the most important.

While ME typically refers to the internal or interior wear on the barrel at the muzzle, MW is actually the condition of the crown. There, you're looking for imperfections like dings, dents, burrs, and 'saw' marks, which are telltale wear patterns from careless and repeated passes of the cleaning rod(s) by previous owner(s), typically soldiers. The rods have basically cut into the crown, which is final contact point for the bullet before it exits the barrel.

So on a given USGI barrel, you can have a relatively high TE number without accuracy being noticeably affected as long as the ME measures out on the low end and the condition of the crown is otherwise intact (MW).
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Old May 12, 2019, 09:53 AM   #28
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Good info thanks. I have purchased a muzzle protector to use while cleaning along with ratcheting chamber brush , and plastic chamber insert. May use bore snake for cleaning between sessions.

If in future I buy one with USGI barrel I will inspect as suggested.
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Old May 13, 2019, 12:09 AM   #29
Join Date: March 18, 2019
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+1 on the bore snake. If you're shooting any non-corrosive ammo a bore snake is all you really need to clean 95%+ of the gunk out. No need to religiously clean the bore with a rod every range trip of 50 rounds.

Dirt, dust and burnt powder attracts moisture and rust. No gunk no rust.
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