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 carbine 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 capacities. It can be seen as a SAAMI-certified copy of J. D. Jones' wildcat .300 Whisper.
While 5.56×45mm NATO has enjoyed widespread acceptance in military circles, the nature of the missions encountered by some special operations groups often demand a round that provides better performance than that available in the high-energy standard velocity rounds and subsonic performance greater than standard 9mm (the ubiquitous pistol round also commonly used in many SMGs). To satisfy this need, AAC developed the 300 AAC Blackout in cooperation with Remington Defense. By keeping the M4/M16 in mind as the primary host during load development, the designers could work up a host of cartridges that not only satisfied the ballistic requirements set forth, but also ensured mechanical reliability with the fewest changes to the weapon itself -- with only a simple barrel change necessary for complete conversion.
The US Special Operations Command (SOCOM) as of March 2017, has requested defense industry proposals for conversion kits from 5.56 to the .300 AAC, highlighting interest in making the round more available to the wider Special Operations Community. So far the .300 AAC has seen limited use within certain special operations forces, primarily within JSOC. This was due to operators preferring the higher stopping power within close quarter battle engagements compared to 5.56 rounds that are commonly used.
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