Is there any kind of military spec for AR gas hole location in regards to rifling? I see people talking a about gas hole size and location on a frequent basis around here but no one seems to mention if it is drilled in a rifling groove.
https://www.m4carbine.net/archive/in...p/t-87315.html
FWIW I’ve read on AK forums that it is important. There is a guy out there that was cutting barrel stubs in half with a wire EDM machine and the gas hole was consistently in the groove on ’74 barrels both krink length and the normal 16” length.


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