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What is the small number on the barrel of my M28/30 or M39 behind the front sight?

April 26, 2017Barrel m28 m39 sight small

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What is the small number on the barrel of my M28/30 or M39 behind the front sight?

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A. That is the height of the front sight blade. The same number should also be stamped on top of the blade. This was done so that the armorers could quickly check to make sure that the soldier had not made field adjustments to the sight blade which was not allowed.