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Jason, yes sir, this can be used for either 5.56 or 300 blackout. Hope this helps.

Its should work just fine 300B/556 use the same BCG, Buffer and CH.Only difference is magazines and barrel. Stay safe!

Jason, yes Sir, 300 Blackout shares the same case head dimensions as the . 223 Remington / 5.56mm NATO cartridge, it allows use of the same bolt carrier group and magazines as a standard M4/AR-15, making conversion as simple as swapping the barrel and muzzle device.