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An Army captain’s research paper, written at a Marine Corps professional school, criticized the service’s move to a new rifle and reignited a long-standing debate among infantrymen: heavier caliber or more rounds?

In 2018, the Army began developing its Next Generation Squad Weapon rifle, the XM7, as a replacement for the M4A1 carbine. Compared to its predecessor, the Sig Sauer-produced XM7 fires a heavier round that the Army says improves “accuracy, range, signature management,

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