regulation

I'm curious, is there a pathway, even a challenging/rare one that allows you to convert your certified piston aircraft to an experimental one? For instance, let's say you had plans to make modifications in the name of testing new technologies/equipment onboard. Are you able to do that? If not...

Are there any special regulations I need to be aware of when it comes to flying with my firearms? Specifically flying out of Illinois to Arizona? Assuming stops in KS, TX, NM and AZ in case that's relevant. I'd like to avoid doing anything that could land me in trouble. Specifically, any...

This is from the FAA Aviation Maintenance Technician Handbook.