This AR15 to M16 Conversion works, but not only is highly illegal, any conversion of an AR-15 to fully automatic that I know of is irreversible and highly obvious as it needs to have a new pin hole drilled in the lower receiver to take the M-16 fire control group. It will also need an M-16 bolt which is slightly different than a semi-automatic bolt.
Both bolts are rather interchangeable in an AR, and many kits for the AR-15 come with the Fully automatic bolt.
Be aware, however, of the BATFE’s legal riddle of constructive possession. They have arrested individual and taken them to court because they have the parts to make a machine gun without showing the act or intent of actually making a machine gun. They say if you can, then you will. Personally I think it is a little too much like minority report with that mindset I say we indict them all for aggravated rape – all agents have guns and sex organs – its not a stretch to say they intend to use them….AR15 to M16 Conversion
Also in the event you are interested, all of these gun documents I am posting can be found on the disk I have listed to your left. Additionally to the hundreds of documents I have posted, I have hundreds of gun patents (mostly suppressors) as well as class PowerPoints and targets. all for $5.