Originally Posted by
One More Time
That's cool they are taking care of it.
Are you using the 1.4646" 5.56 go gauge?
On my WC .223W it will not close on a 1.4646" but does close on a 1.4636" (several bolts used)
The Faxon barrel I had in .223W was the same way.
The only 5.56 NATO marked barrels I have that close on a Colt spec go gauge are FN.
To answer your question: I used a Clymer set for "5.56 NATO". Go=1.4636" Nogo=1.4696"
In what was a real PIA, I tried like hell to find a combo that would work. I used bolts by Brownells, LMT, BCM, and Colt. The damn thing just wouldn't close. But, I was fairly certain that the problem was "borderline" and, as long as I checked for proper feeding, ejection, and to ensure the system was in battery, I could safely test the gas system. Initially, function was OK. As I outlined above, the tight chamber appeared to get more constraining as I used it, with the accumulation of "gun gunk" (i.e., burned and unburned powder, metal shavings, lube) and heat expansion in the parts affected. In other words, it started to get real hard to pull a live cartridge out of the chamber after about 20 rounds. It was past time to call the manufacturer.
'That whole effort was held together by sweat, shame, and a tiny bit of pride.' -- Son of Commander Paisley
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