This front flip-up cover is compatible with the Aimpoint Acro C-2 and P-2 red dot series, and protect the optic from dust, dirt, and other debris, as well as reducing the risk of lens damage during storage and transport. Its see-through design allows the optic to be used even when the cover is closed. Aimpoint LensCover Front Transparent Flip-Up for Acro P-2 ONLY 200749