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It seems the problem with "Blue Sky" markings on M1 carbine barrels was that they apparently used at least a 30 ton hydraulic press or a 20 pound sledge hammer to stamp them and caused indentations that extened through to the bore.
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While that may be true in some cases, I have an underwood carbine that is stamped so lightly, the stamp is hardly noticeable.
The gun will hold 5 inch groups at 100 yards all day, I know 5 inches isn't a tack driver, but I think it's fair, for a 60 year old milsurp.