12, 20 or 410 gauge, 3” chamber. Single barrel with hammer.12g and 20g have a capability of firing 3” and 2 ¾” shells.410g is capable of firing 3” and 2-1/2” shells.Nickel-chromium-molybdenum steel barrels with internal chrome plating.Ventilated, checkered antiglare rib - medium width (8 mm).White chrome plated steel receiver.Soft, rubber butt pad.Sling swivels.