UTG 1PC Medium Profile Airgun Mount with Stop Pin, 1" Dia Precision Machined From Aircraft-grade Aluminum Alloy with Anodized Black Matte Finish Complete with Stop-Pin for Rock Solid Application Ring Base Designed with Locking Hex Screws to Tightly Fit on Mounts with Airgun/.22 Dovetail Dimensions Reversible Locking Plate to Fit Full Range of Airgun/.22 Rails