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300 Blackout uppers for your AR rifle - 7.5, 9, 10.5, 16 inch and more. .300 ACC pistol uppers from the best brands like Aero, CBC, Radical, Ghost, and more! Free shipping available!
What are your favorite .300 BLK upper receivers? Anything that makes them stand out? Need a dedicated optic for the .300 BLK drops? Check out our Best .300 BLK Scopes & Optics.
300Blk uppers for AR15 in a wide range of Cerakote colors like FDE and OD Green. 300 BLK AR uppers are a top choice for your next hunting AR upper receiver.
Start your build off right with a 300 blackout upper from Palmetto State Armory. We offer AR-15 uppers in various barrel lengths and finishes to fit the needs of your build. We also carry 300 blackout kits , complete guns, and 300 blackout ammo .
Find your dream complete AR-15 300 Blackout upper receiver from Bear Creek Arsenal! 300 Blackout uses the same bolt carrier group (BCG), lower, and magazines as 5.56 NATO and 223 Remington, making it extremely easy to add a new caliber to your arsenal!
With a 16 inch nitride barrel chambered in 300 blackout, this AR15 upper receiver assembly is readily attachable to any Mil-Spec lower receiver. The upper receiver is forged in the M4 flat top design, facilitating easy attachment of rifle scopes and red dot sights to the picatinny rail.
BCM® MK2 Standard 16" 300 BLACKOUT Complete Upper Receiver Group w/ KMR-A15 Handguard
