Back in the days when you couldn't buy this kind of stuff over-the-counter from your favorite manufacturer, the place to go for these types of modifications was Mag-na-port International.
Go down near the bottom of the page at the first link for a description of their "Autoporting" for autoloading pistols:
"That means that no matter how we reform health care, we will keep this promise to the American people: If you like your doctor, you will be able to keep your doctor, period. If you like your health care plan, you'll be able to keep your health care plan, period. No one will take it away, no matter what." – President Obama, AMA speech, June 15, 2009.
see 13:20 - 13:58