What size rounds are used in the M4?

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Multiple Choice

What size rounds are used in the M4?

Explanation:
The M4 fires the 5.56x45mm NATO rifle cartridge. This standard NATO round was chosen to balance light recoil, the ability to carry more rounds, and effective performance at typical engagement distances familiar to infantry. That’s why the rifle is designed around this caliber across the M16/M4 family. The other options are rounds used by different platforms: 7.62x39mm is associated with AK-pattern rifles, (.308 Winchester) is a larger cartridge used in AR-10-type rifles and many bolt-actions, and 9mm Parabellum is a pistol round. The M4 isn’t built around those sizes.

The M4 fires the 5.56x45mm NATO rifle cartridge. This standard NATO round was chosen to balance light recoil, the ability to carry more rounds, and effective performance at typical engagement distances familiar to infantry. That’s why the rifle is designed around this caliber across the M16/M4 family. The other options are rounds used by different platforms: 7.62x39mm is associated with AK-pattern rifles, (.308 Winchester) is a larger cartridge used in AR-10-type rifles and many bolt-actions, and 9mm Parabellum is a pistol round. The M4 isn’t built around those sizes.

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