However long it takes to make them not be worth it, though no minimum sentences. An normal of 30 years might do it, with some real incentives for reintegrating into society upon release as well as possible time of for good behavior (but not getting into fights is not enough to qualify for good behavior).

I agree, it is pretty strict but that is because it is a very serious crime due to the direct impact the gun has on people. Steal the ATM, break into the place in the night, sell cocaine, whatever, but don't fucking threaten peoples life.