I do custom bbl work, if the bbl is 16" the muzzle device does not need to be permanently attached. I have a 5/8" x 24 die so that is not a problem.
this is a 16" custom PSL I built for me.
As far as pricing I would need to know exactly what you want. right now I am not taking any new work till I clear the 4 month or so backlog currently in the shop.