Worth noting that it's illegal to modify a firearm in certain ways, but other ways are totally legal. Which relates back to the distinction between laws that pr

Worth noting that it's illegal to modify a firearm in certain ways, but other ways are totally legal. Which relates back to the distinction between laws that prevent modification vs. laws that enforce safety standards. It's not OK to modify a semi-automatic rifle to be fully-automatic, the same way it's not OK to exploit security holes in your car computer's firmware. However, it's not OK to swap out your car computer's firmware entirely, but it is OK to swap out the barrel, upper, lower, or whatever on your weapon, provided it's certified for sale.