Step up your aim game by equipping the?Meprolight M21 Polarizer Kit M21 PFK. These?Red Dot Sight Accessories?crafted by?Meprolight?sharpen your aiming point to allow more precise and quicker target acquisition?under a wider range of lighting conditions. You may be asking how this device can upgrade your current optic. Well, it acts as a polarizing filter - organizing light waves in a manner that creates a more vivid image while looking down your sights. Additionally, the Meprolight Polarize + Flash Guard Kit?protects the lens from getting scratched?to preserve the quality of your sight. Reducing glare and clarifying your sight makes a massive difference in your overall accuracy and shooting experience.