To ensure this, you also need the correct buffer weight to handle both supers and subs.Ī standard Heavy or "H" buffer. Shouldn't result in excessive recoil or wear. Firing supersonic loads through an AR using a pistol-length gas tube Virtually all 300 BLK builds use a pistol gas system, and it's what we recommend to use regardless of your choice in ammo. The Best Buffer for 300 BLK Supers and Subs A carbine-, mid- or rifle-length gas tube might not provide enough energy for the bolt to cycle in the upper receiver when firing subsonic loads, causing failures to feeding and eject rounds. To reliably cycle subsonic ammo, you will need a pistol-length gas tube. The 5.56/.223-chambered AR's gas system can be used with 300 BLK. These are the only parts that are exclusive to. In fact, many shooters convert their existing ARs to 300 BLK from these common cartridges because it usually only requires modifying two things: The barrel and gas system length.ĪR-15 parts compatible with. 300 AAC Blackout was officially born.īuilding an AR-type rifle, SBR, or pistol chambered in 300 BLK is practically no different than building an AR-15 chambered in 5.56 NATO or. The company submitted this cartridge to SAAMI (the Sporting Arms and Ammunition Manufacturer’s Institution) for testing and approval, and. The Whisper fit in regular AR-15/M4 magazines and still offered a 30-round capacity, thanks to the same shell casing diameter and similar overall length to 5.56. The Whisper used a necked down, re-sized 5.56 NATO shell casing with a typical. The military wanted this cartridge to reuse all other existing components, including the upper and lower receiver, the lower's internals, the bolt and buffer, existing magazines, and handguards.Īmmo manufacturer Advanced Armament Corps. This new round had to work with existing military rifles, including the M4 and M16, without modification beyond simply swapping barrels and gas systems. 30-caliber round that could be made subsonic for better suppression, while also matching the performance of the Russian 7.62x39mm cartridge. Military brass were unhappy with the 5.56's relatively low power and inability to be effectively suppressed due to its supersonic velocity. 300 AAC Blackout (shortened to "300 BLK") is a rifle round developed by Advanced Armament Corp. This is your guide to building an AR-15 in 300 AAC Blackout. But to make sure your 300 BLK-chambered AR can shoot both supers and subs with good accuracy and reliable cycling, you've got configure it the right way. 300 Blackout is an impressive cartridge: It can be fired suppressed or un-suppressed, subsonic or supersonic, with no modification to the rifle or pistol that's firing it.
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