That is a much higher pressure than the 5.56 x 45 mm NATO round chambered by M4 carbines and M249 machine guns, which has a maximum chamber pressure of 62,000 pounds per square inch.

A Soldier assigned to B Co., 2nd Battalion, 5th Cavalry Regiment, 1st Armored Brigade Combat Team, 1st Cavalry Division with a M249 light machine gun charges forward during small arms training at ...

November 28, 2012: The U.S. Army finally got its lightweight 5.56mm machine-gun. The new LSAT (Lightweight Small Arms Technology) machine-gun weighs 4.27 kg (9.4 pounds) compared to 8 kg for the ...

What troops on the ground in Afghanistan can't go without is the M249 Squad Automatic Weapon (SAW). Check out this SAW gunner in action > Every day is routine for deployed U.S. troops.

The M855A1 Enhanced Performance Round(EPR) is the newest member of the U.S. Army’s small-caliber family of munitions fired from the 5.56 mm family of weapons (M4, M16 and M249). It is replacing ...