About This Ruger Mark IV Silencer Shop Exclusive ModMount
The ModMount system separates firearm fit from optic fit. The Silencer Shop Exclusive receiver base attaches to the four-hole receiver and provides Armadyne's oval interface. A compatible optic-side mount fits into that interface and carries the optic footprint.
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.
Optional vertical and 45-degree offset spacers install between the base and optic-side mount to raise or reposition the optic. Spacers are sold separately unless otherwise stated.
Compatibility
This base fits Ruger Mark IV Silencer Shop Exclusive receivers with two threaded holes ahead of the ejection port and two behind it. Confirmed compatible Ruger models are 40179, 40181, 40182, 40186, and 40193.
This base is only for the Silencer Shop Exclusive four-hole receiver pattern.
- For a standard three-hole receiver, choose from the standard Ruger Mark IV mounts.
- Ruger Mark IV 22/45 Lite models 43946, 43947, and 43948 use the Riton-Equipped Ruger Mark IV mounts.
Installation Notes
Unload the firearm and remove any factory rail or other mount. Secure the ModMount base 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.
