You will need this agm attachment #4 to attach the agm comanche-22 (night vision) or the agm rattler tc (thermal imaging) clip-on riflescopes to your scope. This mount is for agm item 6606sm41 and is suitable for scopes with an outer diameter between 56 and 58.7 mm (three adapters are included). As a rule, these are often rifle scopes with a lens diameter of 50 mm. Choosing the right adapter ring when determining the right adapter ring, you need to calculate with the outer dimensions of your riflescope, including the housing on the objective lens side. So it's not about the diameter of the objective itself, but basically these scopes often have a 50mm objective. This mount #4 is suitable for riflescopes with the following outer diameters: - 56 mm - 57 mm - 58.7 mm does your riflescope have a different outer diameter? Then take a look at the other adapter rings in the optional accessories. Not sure what size you should have? Please contact us. How does it work? The agm assembly #4 comes with three different adapters. You use the adapter that corresponds to the outer diameter of your scope. You insert this into the mount. Then open the assembly by turning the screw. You slide the mount over the body of your scope and then screw it back on. Finally, screw the agm comanche-22 or agm rattler tc lightly and firmly into the threads of this mount. Application agm clip-on mount #4 (6606sm41) this mount is the essential part to attach an agm clip-on to your scope (e.g. from vortex, konus, swarovski, zeiss, hawke, meopta or leupold). This adapter is for use with the agm comanche-22 and agm rattler tc series. With the comanche-22 night vision sight, you can turn your riflescope into a night vision scope. With the agm rattler tc thermal imaging clip-on, you can turn your riflescope into a thermal imaging scope. This assembly is easy to assemble and disassemble.