Yawn...
"Yawn..."
Maybe this will wake you up:
http://www.allelectronics.com/pdf/CAT406.pdf
http://dkc3.digikey.com/PDF/T062/DigiKey.pdf
http://www.mouser.com//index.cfm?handler=catalogdownloads
Each of these companies sells hundreds or thousands (or hundreds of thousands) of components. The first one is only 96 pages, but includes pressure switches, batteries, wireless remote controls, and many other things that "could be used to make weapons..."
How the heck do you think we could run background checks on everyone that uses these catalogs? You want to double the size of the government in one fell swoop?