The RD-ARMOR is a cover for the AT3 RD-50 that protects your optic from dust, scratches, and moisture. The attached lens caps won’t get lost, and easily lock together with one hand when not in use. The RD-ARMOR is made from a durable thermoplastic elastomer that withstands oils, solvents, and harsh outdoor conditions. It can be easily installed and removed from your RD-50 in a matter of seconds. You may find that mounting the RD-ARMOR on an RD-50 without a riser mount may interfere with fully closing the lens caps, but don't worry. The cover can be easily modified for applications without a riser on single rail mounts, and we provide easy-to-follow instructions with each unit on how to do so. This optic cover is also compatible with other popular red dot optics. If you're not sure if your optic will fit, just contact us and we'll help you out!