That used to be true, but 300 BLK solved that about 1.5 years go.
The AAC 16 inch barrel is carbine. It shoots subsonic and will lock open on an empty mag. If you put it on a full auto lower, it will cycle at Colt M4 cyclic rates.
Agreed adjustible gas is not needed. I am not even aware of any such system being sold - for a good reason.
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