Can You Own a Mini Cannon in Michigan? Yes—With a Permit

Short answer: Yes. Under Michigan law, a mini cannon classified as a "destructive device" can be legally possessed with a proper state permit.

The Legal Framework

• Michigan Penal Code § 750.224 — Regulates "destructive devices" (includes cannons, mortars, grenades, etc.)
• Permit required: From Michigan State Police (MSP) — application, background check, fee
• Federal overlay: NFA (National Firearms Act) — $200 tax stamp, ATF Form 1 (make) or Form 4 (transfer), fingerprints, photos, CLEO notification

What "Mini Cannon" Means Legally

• Bore > 0.50 inch (12.7 mm) → destructive device
• Black powder muzzleloaders *may* be exempt if antique/replica (ATF ruling dependent)
• Salute cannons, signal cannons, novelty cannons — often still regulated

Critical Caveats

• Local ordinances (city/township) may ban discharge or possession entirely
• Storage/transport rules apply (locked, unloaded, separate powder)
• Insurance/liability — standard homeowners won't cover
• Laws change — MSP Firearms Records Unit: 517-241-1917

Bottom Line

Legal? Yes, with permits (state + federal). Practical? Heavy paperwork, cost, restrictions. Consult a firearms attorney or MSP before buying/building. "It's just a toy" doesn't fly with the ATF.