Sightmarks Mini Shot A-Spec M3 is the ideal sight for home-defense and short-to-mid range shooting endeavors. The A-Spec M3 is manufactured to be compatible for pistols with a Shield RMS-C footprint, and it boasts a red auto-brightness control reticle to accommodate shootingat any time, day or night.Features : Fits Pistols with Shield RMS-C Footprint Auto-Brightness Control Reticle Co-Witness with Standard Pistol Sights Red Reticle Illumination Rugged Aluminum Alloy Housing IP55 Water-Resistant