UDplus, Inc. Dovetail-To-Picatinny Low Profile Rail Adaptor, Black .22/Airgun Dovetail to Picatinny/Weaver Rail Adaptor Innovative Rail Platform to Convert Most .22/Airgun Rails Top Slot with Spring Tension Retraction/Expansion Design to Snap into Picatinny/Weaver Base Easy Installation with Most .22/Airgun Rails, 2PCs/Set(1*adapter / 1*wrench) Extremely Low Profile and Lightweight, Precision and Repeatable Alignment