Just a minute Ed......, I WROTE huge parts of the L2A3 Sterling and L4 Bren EMER............!
As for the No4 muzzle wear, then we say the GAUGE, Armourers, plug No2 .308" diameter No2 MUST NOT enter the muzzle by more than .25". If it does, then the barrel will be rejected and condemned. Even when the barrel rejects the gauge, where it (the barrel) is suspect, it will be range tested for accuracy and rejected if it fails.
The long and short is it will be rejected if it fails the accuracy test and/or the No2 .308" gauge
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