In 2018 the Marine Corps will be adopting the Army’s enhanced 5.56mm rifle round for Marines in combat.
The Army’s M855A1 round has proved a deadlier bullet than the Corps’ M855 5.56mm round, said Chris Woodburn of the Corps’ Combat Development Command.
“The M855A1 provides improved performance over the current M855, 5.56mm round in a lead-free form factor, and provides improved steel penetration, hard- and soft-target terminal effects, with more consistent terminal effects than the M855 at ranges out to 600 meters,” Woodburn told Marine Corps Times.
The Marine Corps will begin procuring the enhanced round for its combat stockpiles this fiscal year, said Woodburn. Deployed Marines who are issued M855A1 rounds can use them now.