The Warne Shotgun Rib Reflex Mount is a revolutionary new mount design that allows shooters to mount various RDS sights with the ARCO interface to most vented rib shotgun barrel. Many popular shotgun *models are not drilled and tapped for a conventional scope base or rail, Warne s proprietary clamp design attaches directly to a vented rib 6-10mm wide and allows for a low profile universal mounting plate that fits most popular Mini RDS sights. While The Warne Shotgun Rib Reflex Mount is great for turkey, waterfowl and upland bird hunting, it is equally effective for clays, competition and tactical use. Product Features Lightweight Aluminum Fits Most Shotgun Ribs Designed and MADE IN USA Product Specifications Weight: 1.7 oz Fits: Mini Red Dots *Does not fit Benelli 20 gauge rib