The STB 556 is one of the best Assault Rifles in Call Of Duty: Modern Warfare 3, known for its mid to long-range capabilities, low recoil and incredible accuracy. If you are after a reliable AR that has good all-around stats, the STB 556 is a great option.

In some cases, the 5.56mm bullet can pierce through armor, but that needs some extra amplification. The . 300 BLK, on the other hand, is a larger diameter round that is often slower but hits with more ft-lbs on target.