And there will continue to be handguns and auto sears coming across the USA-Canada border until there exists the political will to crack down on smuggling via the cross-border native reserves.
The border is 5500 miles long. The reserves may be the easiest place to smuggle guns across today, and $4B worth of goods cross the border every day. That's a lot of miles to guard and trucks to inspect. If we stepped up enforcement on reserves, the smuggling would just move elsewhere.
No one’s smuggling any quantity of autosears that you can buy on Aliexpress or Wish or print yourself on any 3d printer in 30 minutes.