The ring height to mount the ATN ThOR LT 4-8x50mm Thermal Rifle Scope depends on what type of rifle you are using. However, the ATN ThOR LT 4-8x50mm Thermal Rifle Scope should work fine with 30mm medium height rings. The ATN ThOR LT 4-8x50mm Thermal Rifle Scope model number: TIWSTLT125OP-KIT1 comes with a QD mount.