USED Reptilia Dot Mount Lower 1/3 Co-Witness for Trijicon MRO Black. Machined from billet 7075-T6 aluminum with Milspec Type III hard anodized finish the DOT Mount attaches to any M1913 Picatinny rail and offers lower 1/3 co-witness with standard AR15-style back-up sights. Its spring-loaded nitrided steel clamp and mounting bolt simplify the installation process and sit flush with the body of the mount for a low-profile anti-snag design. Compatible with: Aimpoint Micro R-1 H-1 H-2 T-1 T-2 CompM5 Sig Sauer ROMEO4 ROMEO5 & ROMEO-MSR Vortex Optics Crossfire Spitfire Sparc I & II Primary Arms Classic Series Gen II SLx Advanced Rotary Knob Microdot & SLx Compact 120 Prism Scope ACSS-Cyclops Holosun Technologies HS403(not HS403A) HE403 HS503 HE503 HS515 HE515 & HE530. Specifications for Reptilia Dot Mount Lower 1/3 Co-Witness for Trijicon MRO: Manufacturer: Reptilia Finish: Type III Hardcoat Anodized Gun Make: AR Platform Gun Model: AR-15 Fabric/Material: 7075 Aluminum Red Dot Sights-Footprint: MRO Attachment Type: Picatinny Optic Cut: Trijicon MRO Height: 1.54 in Weight: 51 g Country of Origin: USA Package Contents: Reptilia Dot Mount Lower 1/3 Co-Witness for Trijicon MRO Mounting Screws Hex L-Key Reptilia 100-022: Dot Mount Lower 1/3 Co-Witness for Trijicon MRO Black