| For the 5.56 M193 and M855 to frag and produce a massive wound, they need impact velocities in excess of 2500 fps, and is only going to do it reliably above 2700 fps.
With extremely short barrels, the effective range for the frag effect with M855 5.56 can be as short as 15m.
Barrel length and ammo selection make a major impact on fragmentation range. |