AR Barrel Bore Pin Guage
What pin guage(s) is/are best for confirming an AR .223 barrel isn't under-bore?
I'm trying to isolate the reason a barrel is shooting high velocity and popping primers. I measured jump to lands, and that matches a known good (Colt) barrel. So I'm down to tight bore, or non-5.56 chamber.
Pin guages are cheap, so I'd like to eliminate the tight bore possibility before spending the money on a 5.56 Chamber reamer.
SHOULD at .223 pin guage pass through an AR 5.56 barrel??
Last edited by markm; 02-29-24 at 09:59.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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