When the Uzi Carbine first came out, it wasn't long before you could buy slotted open bolts advertised in Shotgun News. They sold quite a few, and for quite some time before ATF stopped them. There were no criminal charges at the time. At first it was simply a matter of modifying the weapon into a non approved configuration. Then they cracked down ruling them "conversion parts" and wanted them picked up. The KG-9, Demro, Ingram etc were all approved as open bolt, but the Uzi was specifically designed to placate ATF. Obviously that turned out to be a winning strategy in the long run.
I would scan the want ads every Sunday morning and remember a guy advertising an Uzi and he had "both bolts" with the package. I actually called him to see if he was willing to negotiate? As far as the open bolt, he had no nefarious intentions; it was just the ability to have the option of something closer to the "real thing". 1979-82 was an interesting time to be into those kinds of guns. It also sucked to be a poor college student.
