Apologies if this has been discussed, I couldn't find anything in a search. I've been wanting to put together another 6.8 upper for a while now, and have been focused on a 12.5" barrel but I can't seem to find anything other than ARP. Is there anything else out there that is quality? All of...

Curious if a gunsmith were to cut down a 16" barrel to 12.5" assuming the 16" was a mid length gas system would there be any issues w/ functionality / reliability?