My new 11.5” G barrel from PA kinda passes the plunk test. More or less…
I can drop a S&B .223 77gr HPBT in all the way and it doesn’t fall out when I turn it over, but it falls out if I tap the barrel with my hand.
When I drop a Frontier 5.56mm 75gr T2 in, I have to lightly push it the last little bit. It does not fall out freely when turned over; I have to bang it down on the work bench pretty good a few times before it falls out.
I used my drill index to gage the gas port; 1/16” (.0625) goes in with light friction and #52 (.0635) kind sort goes in but doesn’t. Gas port is probably ~.063
I installed the barrel anyways. It seems to chamber 5.56 just fine when dropping the bolt release (H2 and Tubbs flatware pushing it) and working the charging handle clears it easily. Screw it… I’m shooting this thing.