According to a TACOM Maintenance Information Message (16-039) released last week, the US Army is introducing a new M4 Enhanced Performance Magazine.  While we haven’t seen an example yet, it will be easy to discern from previous magazines. Sporting a Tan body and Blue follower, it was engineered to address feeding issues with M855A1 ammunition.
The M4 EPM has been assigned NSN 1005-01-630-9508 and will be introduced through attrition of the current magazine. The M4 EPM may also be introduced with M4 carbines going through conversion to the M4A1 configuration.
Read more at Soldiersystems.net
Photo courtesy of thefirearmsblog.com