Evolution Gun Works Sig Sauer M17/M18 Optics Ready Adapter Plate Black. The rear sight plate on your gun needs to be removed to install your red dot on this plate. The plate is mounted to the slide from underneath the slide using the provided 4-40 screws. The red dot is then installed on top of the adapter plate using the provided 6-32 screws. Specifications for Evolution Gun Works Sig Sauer M17/M18 Optics Ready Adapter Plate: Manufacturer: Evolution Gun Works Red Dot Sights-Footprint: Docter Optic Cut: SIG Sauer P320 Optics Ready Fabric/Material: 7075 Aluminum Color: Black Gun Model: SIG Sauer M17 SIG Sauer M18 Width: 0.99 in Length: 1.775 in Gun Make: SIG Sauer Gun Type: Pistol Package Contents: Evolution Gun Works Sig Sauer M17/M18 Optics Ready Adapter Plate What firearm models does the manufacturer say Evolution Gun Works Sig Sauer M17/M18 Optics Ready Adapter Plate is compatible with? The manufacturer suggests that Evolution Gun Works Sig Sauer M17/M18 Optics Ready Adapter Plate is compatible with SIG Sauer M18 SIG Sauer M17Evolution Gun Works 49201: Sig Sauer M17/M18 Optics Ready Adapter Plate Black