Hey guys, don't even try it. From what I heard long time ago in gunsmith school -7's and -22's don't work worth a hoot without a lot of mods. -A lot of real good rifles have been screwed up and then destroyed, and folks gone to jail for messing with them. Same with homade silencers.
-- Pay the $200 tax and get a registered NFA legal rifle from a reputable dealer with whatever goodies you want and then you can show off all this neat paperwork , - AND stay out of trouble!
- It is a lot cheaper in the long run - besides, NFA legal stuff is a real good investment, lots better than enron stock.
PS- I don't do gunsmithing, never wanted to put up with the paperwork hassles. You have to give permission for no- knock -no warrent searches day or night at your place of buisiness, it was part of a machinists course I took when I thought I wanted to be a diesel mechanic, I work for wages instead.