The ORL-121 securely mounts the Osight R to a Picatinny rail and positions its optical centerline 1.21 inches above the rail. Its low-profile design, Type III hard-anodized 6061 aluminum body, steel clamp, and rail-clamp screw create a compact, durable mounting system. The ORH-193 securely mounts the Osight R to a Picatinny rail and positions the optic centerline at 1.93 inches. Its compact, Type III hard-anodized 6061 aluminum body, steel clamp, and robust rail-locking screw provide a durable and secure mounting platform. Shipping: Orders including the Osight R?ORL-121?ORH-193 will be split (except for orders that include only free gifts). It will start shipping in 3-5 workday.