Colorado law prohibits the knowing possession of the following 10 weapons (with some exceptions): 1. Machine guns 2. Submachine guns (SMGs) 3. Short shotguns 4. Short rifles 5. Gas guns 6. Firearm silencers 7. Destructive devices 8. Ballistic knives 9. Blackjacks 10. Metallic Knuckles 1. Machine guns Machine guns shoot more than one shot …