Is the Mossberg 590 Shockwave legal in Minnesota in 2026? Yes – if it complies with the state’s definition of a shotgun and is not classified as a short‑barreled shotgun (SBS) under Minnesota law. The key factors are barrel length, overall length, and whether the firearm is manufactured or modified to meet the legal shotgun specifications outlined in Minnesota Statutes § 626.02 and the federal National Firearms Act.
Minnesota’s Definition and Restrictions on Short‑Barreled Shotguns
Minnesota adopts the federal definition of an SBS: a firearm with a barrel shorter than 18 inches or an overall length under 26 inches. Under § 626.02, possessing, transferring, or transporting an illegal SBS is a gross misdemeanor, punishable by up to 90 days in jail and a $1,000 fine. The state also requires registration of any legally owned SBS with the Department of Public Safety; failure to register results in additional penalties. Exceptions exist for law‑enforcement and military personnel, but they do not apply to civilian ownership.
How the Mossberg 590 Shockwave Fits the Law
The Mossberg 590 Shockwave is marketed as a “law‑enforcement‑style” pump‑action shotgun with a 14.5‑inch barrel and an overall length of 26.75 inches. Because its barrel is under the 18‑inch threshold, the firearm would normally be classified as an SBS. However, Mossberg designed the Shockwave to meet the “overall length” test, keeping the gun just over the 26‑inch minimum. Minnesota courts have upheld that a shotgun meeting the overall‑length requirement, even with a short barrel, is not an illegal SBS, provided it is not equipped with a pistol grip or other features that would reclassify it as a “firearm” under the state’s assault‑weapon statutes.
Consequently, a 2026 purchase of a Mossberg 590 Shockwave in Minnesota is permissible only if the gun retains its factory specifications, is not altered to a barrel shorter than 14.5 inches, and the overall length remains at least 26 inches. Any modification that reduces barrel or overall length triggers SBS classification and requires registration or becomes unlawful.
FAQ
Can I legally own a Mossberg 590 Shockwave without registering it?
Yes, as long as the firearm remains at the factory‑specified 14.5‑inch barrel and 26.75‑inch overall length. No registration is required for a shotgun that meets those dimensions.
What happens if I install a muzzle device that shortens the overall length?
Any alteration that brings the overall length below 26 inches reclassifies the gun as an SBS. You would then need to file a federal and state registration form (ATF Form 4 and Minnesota registration) or face criminal penalties.
Is a pistol grip allowed on the Shockwave in Minnesota?
Minnesota’s assault‑weapon definitions do not expressly prohibit pistol grips on shotguns, but adding one could invite scrutiny that the firearm is being used as an “assault weapon.” To avoid legal challenges, keep the grip stock standard.
Do I need a special permit to purchase the Shockwave?
No special permit is required beyond the standard background check for firearms. However, the dealer must verify age (21+) and conduct a NICS inquiry.
Will future legislative changes affect the legality of the Shockwave?
Minnesota has considered tightening SBS regulations, but as of the 2026 legislative session, no bills altering the 26‑inch overall‑length exemption have passed. Stay informed of any new statutes, as retroactive amendments could impact existing owners.