NOT KNOWN DETAILS ABOUT 5.7 X28 AMMO

The cartridge that FN came up with is neither a pistol cartridge nor a rifle cartridge. It is probably finest referred to as a small caliber, high-velocity centerfire cartridge that looks type of like a miniature rifle spherical.The SS191 Tracer round is made up of combustible chemical substances packed in the rear of the projectile that may be ign