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The RMSw is designed to resist damage from water or other harsh environmental conditions. The RMS-W is gasket sealed to create a watertight fit between the slide and the battery compartment without the need for additional mounting plates. When the sight is mounted it will remain watertight at depths of up to 20 meters for over 30 minutes. The RMS-W also features a newly designed frame that adds thickness to the housing as well as a new side profile. The RMS-W will also be the first sight in the RMS line to benefit from the newly developed hard-coated polymer lens. The RMS-W has the same footprint as all previous Shield mini sights and will fit any slide that has already been cut for the RMS, RMS-C, SMS, or Jpoint. Shield's sight mounting options are vast and they currently offer over 40 solutions to fit a mini sight to a wide range of popular pistols, scopes, shotguns, and rifles. The RMS-W relies on having a tight seal between sight and mounting platform. If you are mounting the RMSw on a single stack or tapered top pistol the fully waterproof feature could be compromised. The Glass Edition has an all new scratch-resistant ultra clear Glass Lens, and upgraded electronics with improved battery contacts with the same frame and low-profile that allows you to co-witness with standard iron sights.