the a.ssault rifle is legal in Louisiana. The reason why the got him is because of the weed. Since he had weed and a gun. they going to hit him with drug trafficking charges. In Louisiana your car is consider your home so you can ride around armed up. But you can't have drugs on you that's when they get you with the drug trafficking charge. It's anywhere from 3-10 years. Most likely he will get 1 jail time which will be suspend and he gets 5 years probation.
You definitely did a good 3 year bid my dude, keep it real.
if not, you're a PO like ricky like dude above said