With SIGG’s FSSG drop-in selector switch. It replaces the rear slide plate on any model Glock and allows the user to switch between full and semi-auto, up to 1200 RPM. Although the legality of making your pistol full-auto varies by location, the price one of these switches is going for on this auction is almost too good a deal to pass up. Of course it always helps to see it in action before you buy:

And when I said any model Glock, I meant it: that’s a Glock 35, which fires .40 caliber. Wouldn’t want to be on the receiving end of that.

Thanks goes to The Firearms Blog.