I have a 14.5 inch Colt Barrel that I want to turn into the correct profile to make a C8 clone.
I know I have the option to make the OD under the gas block to fit either a 0.625" or 0.750" FSB but does anyone have any info on the barrel profile? Was the early o.625" a government profile and the latter 0.750" a heavy barrel. Any one have any correct dimensions?
Contact Craftsman441. He has the dimensions. I personally wouldn't use a 14.4" Colt because you'll destroy the value of the barrel. I'd much rather use a Bushmaster, Windam, etc...
The later .750 was really a pencil profile but with a .750 FSB. It was one the profiles being looked at during the XM4 program.


















































