August 31, 201016 yr Or in other words, why does the profile diameter vary all along the entire shank especially in the M4 variants? Is it for attachment of standardized barrel hardware or is there something to do with harmonics perhaps?
August 31, 201016 yr attachment of standardized barrel hardware or is there something to do with harmonics perhaps It's a bit of both.
August 31, 201016 yr I thought it was to put more metal where they can to help in cooling in sustained fire.
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