The full-auto conversions for Glocks convert the firearms into a Class III weapon and, under certain conditions and in certain US States, they are fully legal. Doing it yourself is a sure way to breath filtered air for many years... We rent out a Glock 18 at
Scottsdale Gun Club Machinegun Adventures . The Glock 18, even with the extended 30-rd magazine used as leverage is extremely hard to control and with a cyclic rate of over 1100 rounds per minute the fun is over almost before you know it.
-AW.