I was meandering round the internet (scary I know) and stumbled across this Glock full-auto conversion
that is supposedly 100% legal provided you don't have it with a Glock pistol.
I understand you can have M16 parts without an M16, as long as you don't have an AR15, but this is something explicitly designed to convert a semi-automatic pistol into a Machine-Gun.
Despite their disclaimer about it being for SOTs, I'm sure this is targeted at people who want to take their Glock and shoot it out in the country where nobody will hear it, but how can this be legal?
Though this is obviously a legitimate company, not the shady supposed ATF Lightning Link Sting in Shotgun News years ago, but how is this any different than that an unregistered Lightning Link?