Sgt. William Francis Coffey II fires an M4 5.56mm carbine rifle April 2015. In 2018 the Marine Corps will be adopting the Army’s enhanced 5.56mm rifle round for Marines in combat. (Lance Cpl. Adam O.

After repeated urgings from Congress to move to a common rifle round with the Army, Marine Corps officials told lawmakers Tuesday that they're getting close to being able to do so. The Marine Corps ...

Preliminary results of an Army test to see how the service's M855A1 5.56mm round performs in Marine Corps weapons show that the enhanced performance round causes reliability and durability problems in ...

The House Armed Services’ Tactical Air and Land Forces Subcommittee has shed light on one of the more bewildering defense procurement realities: the Army and Marine Corps’ use different 5.56x45mm ...

May 30, 2015: The U.S. Army and Marine Corps stopped using the same 5.56mm ammunition in 2010 when the army began using the new lead-free M855A1 5.56mm round for combat (mainly in Afghanistan) ...

PICATINNY ARSENAL, N.J. -- Perhaps no subject is closer to the hearts of Soldiers than their weapons and ammunition. For decades, this intense interest in "guns and ammo" has sparked sharp debate over ...

August 10, 2012: For two years now the U.S. Army has been using the new lead-free M855A1 5.56mm round in Afghanistan. The new round is more expensive and marginally better than the older M855. The ...

U.S. lawmakers recently questioned Army and Marine Corps leaders on small-arms and why the two services buy completely different bullets for the M16A4 rifles and M4 carbines. "You guys are using two ...

The Army set out to develop lead-free bullets to protect the environment. The finished product achieved that goal — and produced the most lethal rifle round to date. The Army set out to develop ...

In Mark Bowden’s book, Black Hawk Down, he describes an incident where a soldier’s CAR-15 5.56mm carbine failed to put down an enemy combatant despite multiple hits to center mass. The ammunition used ...