Yes! I did read about what I need to keep to facilitate an inspection! Did you follow through with TTB and the FAET?
www.ttb.gov under the heading "Firearms and Ammunition" click on "Manufactures" to the right, under "Quick Links" click on"FAET FAQs" that'll take you to "Firearms Excise Tax FAQs" about 3/4 of the way down that page it says "
TAXES and below that
Liability go on down to #5 the first 'link' you come to is 27CFR53.61(b)(5)(ii) click on it you've been directed to the "Eletronic Code of Federal Regulations" where "Electronic Code of Federal Regulations" is underlined (to the right of where it says 'home') click on that now use the arrow at 'browse' and go to Title 27 and click on "GO" Browse Parts "40-399" click on 53 and on the following page go on down to "53.61" and click on that go on down to (b) and read (1) then go on down to (5)
Examples (i) and then to (ii) It's there,,, plain as day. Yes, I do make mistakes, I'm human! I made on the other day and found out for sure I had after calling TECH. The "Frame or receiver, breeching machanism, ect. is not taxed,,,,,,,,,,, until you screw a barrel on it! Hence, why barrel maker XYZ "doesn' t sell of provide receivers!