Next to the original 5.56mm NATO/223, the 300 AAC Blackout (BLK for short) is the most popular chambering for the AR-15 platform, and, as a result, manufacturers now pump out a wide variety of 300 ...

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The 300 Blackout. Everything that is old is new again. Originally designed by JD Jones of SSK and called the 300 Whisper, this unique cartridge now generally called the 300 Blackout allows one weapon ...

The 300 Blackout provides users a larger caliber option to 5.56mm in the same platform size. The 300 Blackout has an efficiency advantage compared to the 5.56 when used in shorter barreled firearms.