A soldier in Ukraine's Special Operations Forces told BI that the upgrade was an adjustment for some, but they got the hang ...

Lastly, the 5.56 cartridge is quite lethal but is also lightweight ... Over the years, the M16 turned into the carbine-length M4 and the even shorter rifles used by special operations forces.

The M855A1, a 5.56 mm Ball ammunition, is an enhanced performance round for today’s combat and training environments. It works with the M4 Carbine, the M249 machine gun, and the H&K and M16A2 ...