Aim ar/m16 6.5 grendel nitride 9310 mpi bdg bolt carrier group $89.95

[montana]

I have three short chambered 5.56 barrels from reputable manufacturers on my shelf I won't use. I keep them as examples. I have one 5.56 barrel that will barely pass the go gauge with a short bolt.One bolt may pass head space with a particular barrel while a different one won't. This is why it is prudent to check head space with the bolt being used with the barrel.. Everyone of those short chambered barrels would chamber rounds reliably. I got into a debate with the Brownelles gunsmith Caleb over this very same subject, which he became very insulting. I noticed he has since removed that video after I gave references and names to do his home work lol. He didn't even know the proper 5.56 go gauge length for the 5.56 NATO chamber. I won't even get into the throat length debate. Short chambers are much more common than over length chambers in my experience. Short chambers will increase pressure and impede reliability. Telling people they don't need to check head space on the AR platform is irresponsible in my opinion, especially when many will push the envelope with reload pressures. Head space gauges cost money, but reconstructive facial surgery or worst could be even more expensive. This is my advice and people can do as they wish with their rifles, since I'm not the one shooting a rifle with out checking head space first..