[TexasRepublic]

What we really need are published templates to cut and form sheet metal into magazines. Some company could sell tempered springs; I doubt there is a law against springs, yet.

[umgud]

Millions of men have the skills and the tools in their garage to make steel mags. Just buy 10 round mags, cut, splice and weld together. Spot weld the springs.

[2ndDivisionVet]

AR 30-Round Magazines Now Available for Download, Seriously

http://www.docstoc.com/docs/141644816/AR-30-Round-Magazines-Now-Available-for-Download-Seriously

[Renegade]

You can make your own springs by wrapping piano wire around a dowel

[SWAMPSNIPER]

Springs are nothing but mandrel bent piano wire.