![]() The 6.8 SPC and the 6.5 Grendel have a larger case head than the 5.56mm NATO cartridge, so a new bolt was required for the host carbine. The adaptation of the 6.8 Remington Special Purpose Cartridge (SPC) and 6.5 Grendel into the AR platform were mildly successful however, they fell short of the mark in several key areas. The search for a host cartridge had begun.Īttempts to integrate new calibers into the AR platform were nothing new to the shooting community. However, Silvers was not dismayed, and he returned to AAC to begin work on a new cartridge that would meet all these needs. Both supersonic and subsonic varieties of ammo needed to be functional for long-range shots as well as close-quarters battle, respectively.The new rifle cartridge needed to be compatible with short-barreled rifles (SBR, barrels under 16”) and be completely functional with a suppressor/silencer.It had to shoot 30 caliber bullets and mimic the ballistic performance of the 7.62x39mm Soviet round.The cartridge case head must be the same as 5.56mm NATO so a bolt change was not needed.The rounds needed to fit into a standard STANAG AR-pattern magazine and maintain a 30-round ammo capacity.However, there were some other requirements that this customer needed as well: Something along the lines of the 7.62x39mm Soviet round fired through the AK-47. Overall, some special forces units were unhappy with the stopping power that the 5.56 NATO and the 9mm (used in several SMGs) offered during close-quarters combat and he wanted something that had more “oomph”. With the widespread adoption of the 5.56x45mm NATO cartridge (civilian ammo designation: 223 Remington) for the M4 carbine, US troops were having to use the round for both long-range and close-quarters combat. The unnamed military customer came to him with a problem that Silvers was eager to solve. The development of the 300 AAC Blackout (designated 300 BLK by SAAMI) rifle cartridge began in 2010 when Robert Silvers of the Advanced Armament Corporation (which was later acquired by Remington) was approached by a member of the US Military “dark ops” community. What is 300 AAC Blackout? The Dark Ops Wishlist Given Form Grab those PMAGs and Aimpoints because we are about to blast away at 300 Blackout vs 556! ![]() In this article, we will compare the new-to-the-scene 300 Blackout to the tried-and-true 5.56mm NATO in this high-velocity AR-15 shootout. Or does the stalwart performance of the 5.56 continue to dominate with its long-range prowess, muzzle velocity, and stopping power? It is a potent combination that many shooters have declared superior to the 5.56mm NATO round.ĭoes the ballistic performance of the 300 BLK warrant widespread adoption of the cartridge by the military, law enforcement, and civilians? ![]() However, some shooters wanted more out of their AR platform, they wanted the ability to shoot a 30-caliber bullet without switching over to the AR-10 and 308 Winchester.Įnter the 300 AAC Blackout, the successful marriage of 7.62x39mm terminal ballistics with the modularity of the AR platform. It has been the ammo issued to our frontline soldiers for over a generation and has seen combat on 5 continents in the hands of the U.S. The 5.56mm NATO round has been the gold standard AR-15 cartridge for well over 60 years.
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