Assembly and reassembly is nice, but what about troubleshooting if something goes wrong?
Take a look at the American Gunsmithing Institute (AGI) and see if they have courses available in your field of interests.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT