.300 BLACKOUT
The .300 AAC Blackout (abbreviated as 300 BLK by the SAAMI and 300 AAC Blackout by the C.I.P.), also known as 7.62×35 mm, is an intermediate cartridge developed in the United States by Advanced Armament Corporation (AAC) for use in the M4 carbine. The cartridge yields increased performance in shorter barrels and effective subsonic performance for silencer use when compared to 5.56 mm NATO. The .300 AAC Blackout uses standard 5.56 mm NATO magazines and components with the exception of the barrel.
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