The problem with mandatory minimum sentences is that they are a one-size-fits-all solution.
Yes, armed robbery should be taken very seriously, and it is. I've represented dozens of individuals, if not hundreds, who have been charged with serious offences, including armed robbery. Those individuals all go to jail and usually for a lot longer than the mandatory minimum sentence.
The problem with the mandatory minimum sentence is that the hunter who has an unlicensed firearm, who is technically not in compliance with the law, can also be captured by that minimum sentence, and that's not a good situation.