i went another route and got a Pilot and an Outback for my .22's and then a Sand Storm in .308 to run on my .223's on up. i think it's an excellent set up.
Funny thing is, everything has gone up in price, guns, ammo, etc, but that dang tax stamp is still $200. glad it has not kept up with inflation. it should just go away as it really is not that much of income according to the ATF NFA guys i talk to. last time i checked they only had 10 people working the NFA section to do all the paperwork.
it is kinda like they put the "profiles", limited duty, FMLA type guys on there for gophers and the 10 are actually ones that wanted to do it.
they are broken up by sections in the US and then they have their NFA dealers broken down alphabetically. the store i buy from agents name is Susan. You can get their names and desk numbers off the NFA site.
just don't bug them too much or they will put your paperwork at the bottom of the pile. i usually call the desk at about 6 weeks after they cash my money order, then monthly after that. last one took about 3 months but my first took almost 7!
they definitely have a workload but with instacheck i can't see how it can take that long really.
in Europe some countries like Scotland, Ireland, portions of Germany and Austria it is illegal NOT to hunt w/o a suppressor. i was stationed in Nurnberg from 88-98 and went to Scotland about 4 times a year to visit a buddy who is the game warden on an "estate"! what a job! he harvests the big "beasts" is what they call them (red stag) and hunts fox with a silenced .204. Amazing that he had to pay A LOT for the gun and permits for it, but a can for it is only about $50 right down the street at their version of a 'Sears'.
almost everything from .223 on down is 1/2x28 and .308 and up is 5/8x24 but like said above you can get an adapter for anything. i prefer just the screw on the end type instead of the QD. I'm not switching out cans enough to justify that type of mounting system. Go with one that comes apart and is end user serviceable. my pilot is not, but i can get it pretty clean when i do clean it. they can be Jail broken where they take off the end, clean, service and repack and then put a removable end cap on so you can clean in the future, around $300 for that service, don't think i'll have it done since the can was less than that. the others i can media blast with walnut shells to get the lead off, but the center fires don't lead up like the .22's due to bullet construction, but it is nice to be able to take them apart.
hope that helped anyone needing a little info on cans.