I don't play in NFA land, but if I were I'd have the pro-shop at the range I'm a member of do it. They allow conjugal visits. I even took advantage of that while waiting for my 3 federal business days on a pistol. Hint - unless you have a CCW or a range/shop to transfer through, don't buy a pistol the day before Thanksgiving.
Q el camino purchased off the shelf from local shop on 3-30, fingerprinting and form 4 submission via silencer shop kiosk same day
ATF acceptance / check cashed 5-9
stamp cancelled 12-19
picked up from local dealer 1-2
net 9 month wait, thankful it got through just ahead of the gov't shutdown