I was searching the web regarding the US parts count in 922r and stumbled upon this site, they have calculators for some of the more commonly home built/modified guns as well a generic one. I figured it was most useful to folks doing builds so I posted it here. If mods think it is better off elsewhere feel free to move it (not that you need my permission). Also if it's a dupe, slap me and lock/delete it.
http://thegunwiki.com/Gunwiki/LegalFederal922rParts
http://thegunwiki.com/Gunwiki/LegalFederal922rParts