The .300 AAC Blackout (designated as the 300 BLK by the SAAMI and 300 AAC Blackout by the C.I.P.), also known as 7.62×35mm is a rifle cartridge developed in the United States by Advanced Armament Corporation (AAC) for use in the M4 carbine. Its purpose is to achieve ballistics similar to the 7.62×39mm Soviet cartridge in an AR-15 while using standard AR-15 magazines at their normal capacity. Care should be taken not to use 300 BLK ammunition in a rifle chambered for .223/5.56 or 7.62×40mm Wilson Tactical.

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  1. MobileTaylor

    M2 bullets - what kind of accuracy can I expect?

    I received around 500 of these M2 bullets as a gift. I'm in the process of loading some up for 300 BO. Might try some in 308 as well. Started wondering how accurate these bullets actually are? Can you get 1 MOA out of these old military bullets? Or should I expect 2-3 MOA at best?
  2. Roymil666

    Build Thread  Muzzle device LOOSE

    So I've got a 300blk build that I recently swapped barrels on. It now has a Rainier Arms ULTRAMATCH MOD2 10" from a Ballistic Advantage premium 9". Threading my suppressor onto it I noticed that the threads seem small. As in there is a ton of wobble on the threads all the way up to the point of...
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