Go from bird to deer gun and back again in under a minute. The Convert-A-Mount system, designed primarily for 12 and 20 gauges, lets you quickly mount a scope on your shotgun. Just tighten two thumb screws, and the scope is perfectly aligned on machined v-rails. Removal is just as easy; when the scope bracket is off, you have a "clean" sighting plane for bird hunting. System comes with base, bracket and medium detachable top mount rings.