TRIROCK See Through Low Profile 8 Slots Picatinny Riser Extension Weaver Dovetail Rail Scope Mount Base Adapter Fits 21mm for Optics

Machined from Aircraft-grade Aluminum Alloy with Anodized Black Matte Finish, that enhances durability and makes it operable in various environments and situations. It provides a platform that is comaptible with Picatinny and Weaver type standards, that could provides a more comfortable cheek rest and ergonomic scope position. Engineered to provide optimum mounting height for the optics and ring combinations. Low profile, it features a see-through channel for using with iron sights. Friendly install or release by the two thumb screws to fit on standard 21mm Picatinny Rails.