The M27 IAR is chambered for 5.56mm NATO legacy cartridge, while the M7 rifle is chambered for the larger and more modern 6.8mm round.
Source: Marine Corps Times | Author: Daniel Terrill | Published: Fri, 27 Feb 2026 17:02:55 +0000
Stick to your guns: Why the Marine Corps is opting for the M27 over the Army’s M7
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