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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Newington, NH (April 7, 2015) – SIG SAUER, Inc., designer and manufacturer of the world’s most reliable firearms, accessories, and ammunition, is pleased to announce its new 300 Blackout Supersonic ...

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.