About This Ruger Mark IV ModMount Base
This receiver-side base attaches to the standard three-hole Ruger Mark IV and provides Armadyne's oval ModMount interface. Add the optic-side mount that matches your optic footprint to complete the system.
How the Two-Part System Works
The base has a recessed oval interface with two M4 screw locations. The optic-side mount has a matching oval stud that seats in the base, and two flat-head M4 screws secure the parts together. Any ModMount optic-side mount can be used with any ModMount base.
This listing includes the receiver-side base only. Optic-side mounts and optional vertical or 45-degree offset spacers are sold separately unless specifically included.
Compatibility
This base fits Ruger Mark IV receivers with the standard three-hole pattern: two threaded holes ahead of the ejection port and one immediately behind it.
- Ruger Mark IV 22/45 Lite models 43946, 43947, and 43948 use the Riton-Equipped Ruger Mark IV mounts.
- Silencer Shop Exclusive models 40179, 40181, 40182, 40186, and 40193 use the Silencer Shop Exclusive Ruger Mark IV mounts.
Installation Notes
Unload the firearm and remove the factory rail or other mount. Position the ModMount base on the receiver and secure it with the supplied two #6-48 x 1/8 flat-head screws.
Seat the optic-side mount, or an optional spacer and optic-side mount, in the oval interface and secure the assembly with two flat-head M4 screws. Attach the optic and dry-fit the assembly before final installation. Confirm that no optic screw protrudes through the optic-side mount far enough to contact or scratch the receiver.
Follow the Ruger Mark IV installation instructions for the complete screw-length check, torque values, and optional thread locker adjustment.
Designed and Manufactured in the USA
Armadyne ModMount bases, optic-side mounts, and spacers are designed and manufactured in the USA. Each component is CNC machined from 6061-T6 aluminum in our Lincoln, Nebraska shop, then sandblasted and finished with H-Series Cerakote for wear and corrosion resistance.
Warranty and Returns
Armadyne stands behind the mounts and components we manufacture. Review our warranty and returns information for support, exchanges, and discretionary return terms.
