Upgrade your SLx or GLx MD-21 microdot with this high-quality anti reflection device. It simply screws onto the objective bell and the hex pattern effectively prevents glare from the sun reflecting off the objective lens. Eliminating scope glint can also be helpful in hunting situations as bright reflections can possibly scare away deer. It also is extremely helpful in keeping your glass clean from dirt and debris that can possibly scratch the lens. This ARD is made from Aluminum and is hardcoat anodized black to match your optic. This model only fits the SLx or GLx MD-21 microdots. EXPORT CONTROLLED ITEMS: These items are controlled for export and may require an export license from the U.S. Government. Buyer acknowledges that Buyer is responsible for obtaining all export licensing authorizations and filing all export documents prior to export from the United States.