Josh, no Sir. 300Blk is a 30 Caliber Round and 5.56/.223 are 22 Caliber. All you would need my man is a 5.56 Upper to attach to this lower as the lower is universal to both calibers.
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Anonymous
Answered
DO NOT TRY TO USE 223 OR 5.56 NATO ammo in this gun it is chambered for 300 blackout ammo , also known as 7.62×35mm
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Anonymous
Answered
Josh, No, this firearm is a 300 blackout firearm not .223/5.56 firearm. Barrel and chamber are much larger for the 7.62 diameter round. 5.56 diameter would be dangerous to fire from that dimension chamber and barrel.
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Anonymous
Answered
No Josh, this is a 300 Blackout model ..chambered in 300 Blackout, it only functions with 300 Blackout ammunition (AKA 300 AAC) Can't use 223 or 5.56 in this one.
