Different colored lenses are widely used on military flashlights, especially on night vision devices. Each color will serve specific purpose and for RED; it uses to cut down the light at night so you will not become the target of your enemies as well as preserving your night vision.
FMA Airsoft has just released the Red Cover for your TMC dummy PVS15 / PVS18.....ever want to simulate the real situation as seen in battlefield, simply install one then everyone will surprise how professional you are.
Purchased under the impression that these were front tube covers. At the time of this review no where on the item listing does it say that it is a rear NOD filter/cover. So the entire idea of adding a unique look to your dummy nods is out the window. On top of all of that. THEY DO NOT EVEN COME ASSEMBLED. That’s right you need to super glue in the pieces yourself if you want these things to not fall out and poke you in the eye. Don’t waste your money or time on these.