Trijicon offers the MRO Objective Flip Cap to protect the objective lens of your red dot sight from dirt, debris, and other depredations due to the elements. Made from a high quality, military-grade polymer, the Trijicon MRO Objective Flip Cap is spring loaded so it pops up and out of the way with a flick of your finger. Slip-on fit Shields the objective lens from things that are bad for high-grade glass Matte black finish matches finish on the MRO itself The Trijicon MRO Objective Flip Cap has a ratcheted collar that lets you place the retainer ring where you want it so the cap flips out at whatever angle suits your needs best. Mfg: Trijicon