The new caliber outperforms both 5.56 mm and 7.62 mm.
The Next Generation Squad Weapon is expected to begin fielding within two years.
In the span of an enlistment, the Marine infantryman has seen weapons changes that previously took decades.
The Corps will continue to field the remaining M27s that have been purchased to the infantry and combat engineer battalions through 2021.
New methods of firing a completely different bullet will be on display at the test fire.
The outer armory door, the weapons vault and all of the weapons racks were unlocked.
The pictures may depict a trend of U.S. military weapons supplied to the Afghan military falling into Taliban hands.
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