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Yes, but you may have to get 330 Blackout magazines (Magpul) and change the spring and buffer.

Chris, yes, You can convert any standard 5.56 AR-15 to .300 AAC Blackout by merely changing only the barrel. I would use these for feeding reliability as well : https://www.budsgunshop.com/catalog/product_info.php/products_id/714017896/magpul+pmag+m3+300blk+30rd+blk

Yes sir, it's not terribly difficult if one has a torque wrench and barrel nut wrench. The bolt carrier group and magazines that came with the gun will work just fine with 300 BO.

yes it can be done but I would think about just getting a complete upper and being able to shoot both easily