The Model 3000 was available in 12 and 20 gauge, chambering 2+3⁄4 or 3 in (7.0 or 7.6 cm) shotshells.[1] A "slug gun" variant chambered for 2+3⁄4-inch shells with a magazine extension and a shorter barrel was offered in 12 gauge only, with optional open sights.[1]
Sportsman and tactical versions were produced; the tactical versions were used by some American police departments. Like the semi-automaticModel 1000 that was offered during the same era, the Model 3000 was sold for a short time by Mossberg after it was discontinued by Smith & Wesson.[3]