06-13-2019, 02:20 AM
The A2 profile was an attempt by the Marines to accurize the original .625 " diameter A1/M16 pencil barrel by bumping it up to a .750 diameter. Turned out to be pretty heavy so they thinned it back down to .625 from the gas block aft and called it good. Only a committee could do that, lol. The M4 profile is a shortened A2 with a section turned down to .625 so legacy grenade launchers would still fit.
The Faxon Gunner that I have in .556 is a shooter and it has the beef in the back and skinny part forward like God intended.
The Faxon Gunner that I have in .556 is a shooter and it has the beef in the back and skinny part forward like God intended.