20-gauge version of the 870, introduced just five years after the 12-gauge original. The 20-gauge 870 uses a scaled receiver specifically designed for the smaller gauge rather than simply adapting the 12-gauge frame. It became the most popular youth, women's, and upland hunting shotgun in American history. Type: Shotgun Action: Pump-Action Caliber: 20 Gauge Capacity: 4 Year introduced: 1955, USA Weight: 5.75 oz Overall length: 46" Status: Active Intended use: Upland Hunting, Youth, Skeet