.300 Blackout in a .223 chamber? Apr 2, 2019 12:34:04 GMT -7 via mobile Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by rbglock on Apr 2, 2019 12:34:04 GMT -7 Kaboomwww.quora.com/Can-I-shoot-a-300-Blackout-cartridge-out-of-an-AR-15-chambered-5-56-223