sent 2 ar uppers in 300-221 out to be threaded with a print and my suppressor. shop called today. they were confused. how come i was getting 2 uppers threaded but only 1 suppressor. seems they think a suppressor can only have 1 host. i explained it but they still seemed confused. seems to me, if your in the business and you offer a service, thread barrels for suppressors, you might want to research it just a little... ok. i'm off my soap box.