The designation of M468 stands for an M4 carbine chambered for the 6.8 mm SPC cartridge .
The Barrett M468 is a variant of the M4 Carbine , rechambered for a heavier and larger 6.8 mm bullet for increased terminal performance .
The designation of variant stands for an M4 carbine chambered for the 6.8 mm SPC cartridge .
The Barrett M468 is a variant of the M4 Carbine , rechambered for a heavier and larger 6.8 mm bullet for increased terminal performance .