photogpat wrote:He should consult an attorney.
The best answer is above.
I would say no because Minnesota defines a firearm that a projectile is propelled by an explosive charge which a muzzleloader does.
So a muzzleloader is defined as a firearm under that definition and a felon cannot be in possession of a firearm.
Back in 2006 John Fleming was charged in Ramsey County with unlawful possession of a firearm which was a BB gun. The appellate court's defined a firearm is "any gun from which a shot or a projectile is discharged by means of explosive, gas or compressed air." Fleming is accused of carrying a black metal BB gun that discharges a pellet by means of a CO2 cartridge. Don't remember how this case turned out, but your buddy needs to consult a good attorney.