Converting a gun to full auto entails 2 things: technical expertise and second, legal paperwork.
The technical expertise generally consists of designing and building a trip lever which is activated by the bolt upon closure. The lever then "trips" the full auto sear or disconnector to release the hammer - thereby allowing safe discharge after lockup. (This is for a closed bolt weapon).
The Legal paperwork is a different matter altogether. It is not a matter of when your gun was built prior to conversion. Heck, John M. Browning could have hand made it back in 1880. Thanks to (ex) President Bush, no more machineguns may be made for civilian use. Anything made today must either be for military, law enforcement, or export. Simply put, it's a no-no today unless your anticipated conversion is done for any of the three and with paperwork granted as a Class II mfg from ATF.
Better to save your ducats for a legal class III firearm. The other route is a quick way to Club Fed and Bubba.
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Vigilantibus et non dormientibus jura subveniunt
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