How I would change the NFA (if I could)

Short of repealing it that is. If we can't do that, here are some of the things I'd do to change it, and the ATF.

1. Repeal the Hughes amendment. If the purpose of the NFA is marginally to raise revenue, then they must allow the activity to be taxed.
2. Change the stamp fee structure - machinguns to go down to $100. Short-barreled firearms go down to $50. Supressors go down to $5. Destructive devices can stay at $200, or go down to $150. Remember, if you're trying to raise revenue, you want to encourage the taxed activity.
3. Remove the Chief LEO requirement for the tax stamp. If NFA items are allowed in a state, the LEO certification shouldn't matter.
4. Allow states to be POC the way they can be for background checks.*
5. Change the definition of machinegun to preclude a malfuntioning firearm.
6. ATF must develop reasonable testing procedures and publish them.

That seems like a good start. Add your own change in the comments.

pm

* A GA Firearms License serves as a background check when purchasing title I firearms.