Suppressors are ALOT of fun! I have a SS Sparrow (.22lr) they are a hoot! This would probably be better served in the NFA section as there are specific steps needed to get a Class III item. I would contact a Class III dealer in your area for the specifics. I just purchased another can a few days ago.
Dont let the times deter you, the wait goes by pretty fast especially the older you get!
Nov 2, 2011 sent form 4, SS Sparrow. Arrived May 29, 2012.
Jan 30, 2012 sent form 1 for SBR. Arrived July 12, 2012
Jan 22, 2013 Sent form 4, 762-SDN-6. Arrived Sept 13, 2013