The 870 Express Synthetic in 20 gauge is the matte-finished, synthetic-stocked version of the Express 20, resistant to weather and requiring less maintenance than the hardwood version. The most common 20-gauge 870 at mass-market retailers. Type: Shotgun Action: Pump-Action Caliber: 20 Gauge Capacity: 4 Year introduced: 1990, USA Weight: 144 oz Overall length: 46.5" Status: Active Intended use: Hunting, Upland, Field