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Pedro, yes this is multi-cal, so it will work great for a 300 blackout AR-15 pistol. Hope this helps.

Pedro, it will fit as snug as a bug in a rug on AR Pistol Upper. Cheers and stay safe!

Pedro, this will work for 300 blackout. Bud's lists this as 223 Rem/556NATO, but it is actually multi-caliber. Have a great day!