Check the listing for details. Tactical FAST LPVO Scope Mount 30mm Ring Offset Optic Riflescope Mount Fits RMR. Condition: New. Listed at 72.80 USD. Description: Ring Diameter: 30mm Rail Mount: 20mm Picatinny Rail Mount Product Material: Made of 7075-T6 aluminum and Type III hard coat anodized black. FAST L.P.V.O Mount Offset Optic Base RMR&T1&T2 Attaches to the front or rear mounting holes of the FAST L.P.V.O Scope Mount. In conjunction with the FAST L.P.V.O Offset Optical Adapter Plate, it provides a mount for attaching the advanced mini red dot sight directly to the scope mount. The offset optical mount places the mini red dot sight at a 35 degree offset from the barrel for faster changeovers. When used with an optical adapter plate, the mechanical centerline of the mini red dot will be 2.05" above the rail installation steps: 1.Put the long sight on the bracket 2.Put in the configuration screws and tighten the screws 3.Install the bracket into the guide rail as shown in the figure 4.Finally tighten the screws to secure the product and complete the installation Tip: Due to the lighting effect, there may be color difference in the pictures taken. Q&A: Q: The logistics information shows that the package has been delivered, but I have not received it. What should I do? A: Dear,please contact us immediately and explain the reason, we will help you obtain the package. Q: What should I do if I have any confusion about the product or logistics? A: Dear,please contact us directly, and we have a specialist to answer your questions. If you receive a package and have any questions or other issues with the item, please contact us by email in a timely manner, and we will provide a satisfactory solution. Please do not submit return requests or leave negative reviews at will.