ADE RD3-023 Valkyrie is a 4 MOA GREEN dot designed to fit any pistol with a PISTOL that is compatible with RMR/SRO, Holosun 407C/507C/508T footprint red dots. The Valkyrie fits all pistol with optic cuts for Trijicon RMR/SRO, including aftermarket slide such as Rockslides, Polymer80 that has a optic cut for Trijicon RMR/SRO..The Valkyrie Gen 2 also fits name brand pistol manufacturer made Optics Ready pistols, such as Glock MOS, S&W M&P 2.0 OP, IWI Masada, Smith Wesson MP C.O.R.E, CZ P10F/10C optics ready, Walther Q5 Match and Springfield XD/XDM/XDS OSP, Canik TP9 SFX/Combat, FN 509/45 Tactical, Shadow Systems MR 920 using pistol manufacturer provided plate marked for Trijicon RMR footprint..Those name brand pistol manufacturer made "Optics Ready" handguns all come with several mounting plates/optic cuts marked for different brands of red dots, such as for Trijicon RMR, Shield RMS and Vortex Venom red dot footprint. The Valkyrie fits one of the pistol manufacturer provided plate marked that is compatible with Trijicon RMR..ADE Valkyrie created a iron sight curve at the end of the body, and also added two white dots on the curve. For the rear of part of the red dot to become a "back up iron sight" to give enough distance to be a Co-Witness back up sight, in addition to the LED dot and pistol equipped iron sight..For non-optics ready pistols that need to use an optic plate/adapter to replace the pistol manufacture equipped rear sight, ADE Valkyrie's rear white dot acts as a pistol factory original rear sight for Co-Witness.4 MOA GREEN Dot. Comes with a picatinny mounting plate and a pair of screws. This red dot does NOT comes with any other optic plate to mount on an specific pistol.Operates with a single CR2032 battery(install underneath). Gives around 800 hour battery life. Auto powers off after 1 hour of inactivity to save battery..Operates with a single CR2032 battery(install underneath). Gives around 800 hour battery life. Auto powers off after 1 hour of inactivity to save battery..Dimension 1.79x1.18x1.4 inches. Weight 1.24 oz. Shockproof/Fogproof.This model is the original ADE Valkyrie, ADE also have a ADE Valkyrie Gen2. The difference between ADE Valkyrie and ADE Valkyrie Gen2 is that the Gen2 is slightly shorter in overall length, and the shorter length allows Gen2 to sit into custom RMR cut, while original Valkyrie only fits optic plate for RMR footprint.