C&H Precision Weapons SIG X-Series Romeo1 Pro Adapter Plate Trijicon RMR/SRO HOLOSUN 407C 507C 508T w/ 10-8 Rear Sight Black. Each plate is precision machined to the tightest tolerances on HAAS CNC machines and each plate goes through multiple quality checks before shipping to our customers. Most of our plates feature a patented stainless steel T-Nut which provide an industry leading six to seven threads of engagement. Since all the mounting hardware is replaceable if any mounting hardware is damaged it can be replaced without replacing the entire plate. Specifications for C&H Precision Weapons SIG X-Series Romeo1 Pro Adapter Plate: Manufacturer: C&H Precision Weapons Red Dot Sights-Footprint: RMR Optic Cut: Trijicon SRO Holosun Trijicon RMR Fabric/Material: 6061 Aluminum Color: Black Gun Model: SIG Sauer 1911 Finish: Mil-Spec Type III Hard Anodized Attachment Type: Screw Weight: 0.125 lb Gun Make: SIG Sauer Width: 4 in Package Contents: C&H Precision Weapons SIG X-Series Romeo1 Pro Adapter Plate Optic Plate 4-40 Plate Mounting Screws 4-40 RMR Mounting Screws 4-40 Holosun Screws Patented 416 Stainless Steel T-Nuts What firearm models does the manufacturer say C&H Precision Weapons SIG X-Series Romeo1 Pro Adapter Plate is compatible with? The manufacturer suggests that C&H Precision Weapons SIG X-Series Romeo1 Pro Adapter Plate is compatible with SIG Sauer 1911C&H Precision Weapons SGX-RSH-10-8: SIG X-Series Romeo1 Pro Adapter Plate Trijicon RMR/SRO HOLOSUN 407C 507C 508T w/ 10-8 Rear Sight Black