.223 Remington

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From left: .222 Remington, 223 Remington, and 5.56×45mm NATO
From left: .222 Remington, 223 Remington, and 5.56×45mm NATO

The .223 Remington (.223 Rem) is a type of firearm cartridge. It is the most used cartridge for AR-15 type rifles.