Earlier quoted context omitted.
That would have been interesting for many, many reasons, the poetry of which being the least interesting. They're a sovereign nation so what happens when you manufacture guns in Indian country? How beholden are you to the BATF's regs, assuming you build with the intention of the firearm never leaving the res?
That is an interesting question... Not sure what the answer would be. But I'm pretty sure they are still under federal law, just not individual states. So probably personal manufacturing fine, for sale (even on the res) would require an FFL.
“tribal police departments generally do not qualify for the exemption from payment of the transfer tax for NFA firearms, are not eligible to receive firearms interstate, and can not possess a ‘post-1986’ machinegun.”[0]
“federal authorities alleged Ho-Chunk Inc. and its subsidiaries had violated federal tobacco laws by shipping and selling “untaxed, unstamped cigarettes to businesses in Nebraska other states.”[1]
[0] https://www.atf.gov/rules-and-regulations/nfa-transfers-trib...
[1] https://www.indianz.com/News/2019/02/04/winnebago-tribe-stil...