Lethality: It is apparent that the close range lethality deficiency of the 5.56mm (M855) is more a matter of perception rather than fact, but there were some exceptions.

The Army is developing a more powerful bullet that’ll penetrate body armor capable of stopping 5.56 mm rounds, the Army’s Chief of Staff Gen. Mark Milley told senators on Thursday. “The 5.

Carter's report should detail why the Army uses the M855A1 round for the M16 while the Marine Corps stayed with the older M855 round and also used the newer Mk318 Mod 0 round.

A test fire an Aberdeen Proving Ground range pitted the M855A1 round against the M855 and the M80 in multiple weapons -- the two 5.56mm rounds were fired in both the M4 and the M16, and the 7.62 ...

It took a few years for the Army to decide on a caliber, but they ultimately chose the “intermediate” 6.8mm to replace the existing 5.56mm used in the M4, M16 and M249. The 6.8mm is similar in ...

Army engineers and scientists optimized the EPM to work with the M4/M4A1, M16 rifle, and standard military 5.56mm small arms round, the M855A1. The M855A1, known also as the Enhanced Performance ...

U.S. Army Staff Sgt. Jared Casey fires a M16 rifle in the kneeling position at a weapons qualification range during the 2017 Army Materiel Command’s Best Warrior Competition July 18, 2017, at ...

First, the 5.56mm NATO is loaded to higher chamber pressures — 61,000 psi vs 55,000 psi. The second difference isn’t in the cartridge itself, but in the chamber specs.

The M16’s predecessor in U.S. military service, the 7.62x51mm NATO (.308 caliber) M14, had become the standard-issue rifle back in 1959, except for the U.S. Air Force Air Police/Security Police ...