Gauges: 12 ga., 20 ga., .410, 3". Barrels: 18.5", 20" (Cyl.). Weight: 7 lbs. Stock: Walnut-finished hardwood or black synthetic. Sights: Metal bead front. Features: Slide-action operation. Available in 6- or 8-round models. Top-mounted safety, double action slide bars, swivel studs, rubber recoil pad. Blue, Parkerized, Marinecote finishes. Mossberg Cablelock included. The HS410 Home Security model is chambered for .410 with 3" chambers and has a pistol grip forend, thick recoil pad, muzzle brake and has special spreader choke on the 18.5" barrel. The overall length is 37.5" Blued finish; synthetic field stock. Mossberg Cablelock and video included. The Mariner model has a Marinecote metal finish to resist rust and corrosion. Synthetic field stock; pistol grip kit included. 500 Tactical 6-shot has black synthetic tactical stock. Introduced 1990. Holosun optics combo variants were introduced in 2024.