300 AAC Blackout

300 AAC Blackout, SAAMI temporary name 300 BLK, also known as 7.62×35mm, is a rifle cartridge developed in the United States for use in the M4 carbine. Its purpose is to achieve ballistics similar to the 7.62×39mm Soviet cartridge in an AR-15 platform while using standard AR-15 magazines at their average capacity.

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