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Yes, William these can be fired out of "Smooth" or "Rifled" barrels. They will of course be more accurate out of a "Rifled Barrel".

Its for use in a Smoothbore shotgun the slug is rifled to help stabilize out of a smoothbore Using the finest components and strictest production standards, Fiocchi provides users with the best option for self-defense. Whether taking advantage of the timeless reliability of a pump action or the speed and efficiency of a semi auto, Fiocchi has spent countless hours perfecting a load that you can depend on when you need it most. For generations law enforcement, military professionals and civilians have trusted Fiocchi to deliver the highest quality ammunition for the most serious applications; protecting community and family. Fiocchi Self Defense Aero Rifled Slug 12SLUG 12 Gauge 2-3/4" 1 Ounce Lead Slug 1560 fps Muzzle Velocity Uses: Self Defense 10 rounds per box. Ammo price is per box.

james g these will cause major leading and not be accurate out of a rifled barrel rifled barrels are designed to fire Sabot slugs like these https://www.budsgunshop.com/catalog/product_info.php/products_id/15474/Hornady+12+Ga.+2+3%2F4+300+Grain+Super+Shock+Tip+Brass+Plated