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Army fielding new magazine optimized for M4/M4A1 Carbine and M855A1

The Army is issuing Soldiers a new small arms 5.56 ammunition magazine designed expressly for the M4/M4A1 carbine and M16 family of weapons.


The 2nd Battalion, 75th Ranger Regiment from Joint Base Lewis-McChord, WA, was the first unit to receive the new "Enhanced Performance Magazine (EPM), as free issue In July," said Anthony Cautero, Assistant Product Manager for the M4/M4A1 Carbine.

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Other units are acquiring smaller quantities through the standard supply system.

Cautero said the regiment received 6,800 magazines in July.

More than 49,000 of the new magazines will be issued to other units at JBLM before the end of the year, he said.

The Army's new magazine, dubbed the Enhanced Performance Magazine , is currently being issued to units through the supply system. It is optimized for use with the Army's steel tipped 5.56mm small arms cartridge, the M855A1, in the M4/M4A1 and M16. The EPM recognizable by its blue-grey follower. | U.S. Army Photo by Rob Hovsepian

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 Round (EPR), has been in use since 2010.

Following the EPR's release, engineering tests of M4/M16 rifles firing the M855A1 showed that the weapons were sensitive to the EPR's steel tip.

A Picatinny Arsenal, N.J. engineering team subsequently made a design change to the magazine that corrected this issue.

The EPM eliminates weapon wear caused by the steel-tipped M855A1 at the upper receiver/barrel extension interface, a condition discovered during laboratory testing.

Soldiers insert the EPM into the magazine well of a carbine's lower receiver that positions rounds for feeding.

The forward moving bolt and bolt carrier assembly strips the rounds from the magazine and feeds them smoothly into the chamber for firing.

Soldiers also can use the new magazine with the previous standard military 5.56mm round, the M855.

Army 1st Lt. Michael White from South Kingstown R.I., platoon leader of 3rd Platoon, Alpha Company, 1-182 Infantry Regiment of the Rhode Island National Guard, fires his M-4 rifle during a training mission. | U.S. Army photo

The EPM is tan-colored and has a blue-gray follower. The latter is the spring-loaded plastic component that positions each round up into the lower receiver of the weapon. Each magazine holds a maximum of 30 rounds.

Tests show that the EPM increases system reliability and durability.

It also ensures optimal performance in M4/M4A1 and M16 weapons when used with the EPM and EPR, Cautero said.

The Army expects to field more than 1.8 million of the new magazines over the next 12 months.

Center Industries of Wichita, Kansas, is the manufacturer.

Cautero said the Army has received more than 700,000 of the new magazines from the company to date.