BudsGunShop.com - Weapon ammo

Calvin - this is for 5.56 / .223 ammo only. It would need a completely new barrel to fire 300 BO, which is a '30 caliber' bullet that won't fire through the .223 caliber barrel. Please don;t even attempt to use 300 BO in this gun.

It only shoots 5.56. If you want it to shoot .300 blackout, then you'll need a gunsmith to replace the barrel. The bolt carrier group would probably be fine. As is, the rifle won't chamber a .300 blackout.

Calvin, 5.56/223 only which are both 22 Caliber bullets. You would need a dedicated 30 Cal 300Blk Barrel to fire 300BLK safely.

It does shoot 2 bullets, but 300bo is not one of them. It shoots 556 and 223.

Only 5.56 or 223. 300 blackout is larger diameter and if chambered and fired would blow the gun up.