What diameter is the gas port hole? — 2 Answers

Thanks for the "expert" answer from Ethan I guess. I own this barrel. Like many other 300BO manufacturer's the gas port hole is undersized. I didn't measure it but it's probably 5/64" or smaller. Very tiny. After I assembled it I was unable to get it to cycle at all with sub or supersonic ammo on a normal carbine spring and H2 buffer with full gas. I drilled out the gas port hole with a cobalt drill bit from mcmaster carr (PN 3069A15) to open it up to 7/64" (0.109"). I probably made it larger than it needed to be but I'm running it on a superlative arms adjustable gas block and it is running smoothly now.