No. There is no distance at which a firearm chambered in a combat caliber is less dangerous than a knife. Even assuming you manage to stab your target, they only need to wound you to prevent you from being an effective combatant with a knife. Whereas they can be severely wounded and still retain almost full function and lethality with their firearm.

When they demand your GP or your HP, you pretend to comply and then execute an attack of opportunity.