03-04-2019, 08:15 PM
I found a barrel today that peaked my interest. The only markings are stamped on the barrel twice, "300 FB". The barrel is exactly 16 inches long, Carbon fiber wrapped, before and after the gas block, non-threaded muzzle, .125 gas port, and carbine length gas system. It appears to have had a A2 style gas block on it at some point. The muzzle measures .300 by a caliber. I figure the 300 fb, is for 300 fireball. But the barrel appears to be carbon fiber wrapped 4150, not stainless. Who made a Carbon fiber wrapped barrel in 300 fireball?