The 20-gauge Boss O/U Sidelock is the preferred commission for driven game shooters who favor a lighter, faster-handling gun without sacrificing the technical perfection of the Boss action. Built on a dedicated 20-gauge frame rather than an adapted 12-bore, the 20-bore Boss O/U achieves an ideal balance point for most shooters while retaining the legendary Boss single trigger and regulated ejectors. Production is measured in single-digit annual numbers. Type: Shotgun Action: O/U Caliber: 20 Gauge Capacity: 2 Year introduced: 1920, United Kingdom Weight: 72 oz Overall length: 44.5" Status: Active Intended use: Driven Game / Upland