CHINA TOPIX

Updated 11:29 AM EDT, Tue, Jun 16, 2020

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M855A1 Enhanced Performance Round (EPR)

Same?

US Marines Set to Adopt Army M855A1 EPR Rounds for their M4s and M16A4s

Army and Marine M4s both have a caliber of 5.56 mm and fire 5.56×45mm NATO rounds.

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