28-gauge Model 37 on a scaled sub-gauge receiver with 28-inch barrel. One of the few pump-action 28-gauge shotguns ever built, it occupies a niche between the common 20-gauge and the rare 28-gauge single-shots. Type: Shotgun Action: Pump-Action Caliber: 28 Gauge Capacity: 3 Year introduced: 1969, USA Weight: 5.5 oz Overall length: 47.5" Status: Active Intended use: Hunting