The Shadow Mount V3.0 is a Ruger® Mark IV™ red dot mount that fastens directly to the receiver using the factory receiver hole layout, so no picatinny rail or clamp sits between the optic and the gun. It fits across the Mark™ Series including the Mark IV™, Mark IV™ 22/45™, 22/45™ LITE, and Mark III™ models. It ships with all the necessary hardware to attach both the mount and the optic. Installation is simple and requires no machining or permanent modification to the pistol.
Who Should Use the Shadow Mount V3.0
Ideal Use Cases
- Steel Challenge or Rimfire Challenge Rimfire Pistol Open competitors, where optics are permitted and the time between plates largely comes down to how fast eye finds its target.
- Ruger® Mark™ Series owners who want to add an optic without drilling, tapping, or otherwise permanently modifying the receiver.
- Shooters with aging eyes or corrective lenses who find a single focal plane easier to work with than a three point iron sight picture.
- Owners of more than one Mark™ Series pistol, since the same mount design covers Mark IV™, Mark III™, and factory drilled and tapped Mark™ I and Mark™ II models with the standard receiver hole layout.
Shadow Mount V3.0 vs. Factory Sight and Mounting Options
Three ways to sight a Ruger® Mark™ Series pistol, and what separates them.
| Feature | TANDEMKROSS Shadow Mount V3.0 | Factory Rail Setup | Factory Iron Sights |
|---|---|---|---|
| Sight picture | One point of reference | One point of reference | Rear notch, front post, and target |
| Mounting method | Optic attaches to the mount, mount attaches to the receiver | Optic attaches to a rail adapter, rail adapter attaches to rail, rail attaches to the receiver | Sights fitted from the factory |
| Parts in the mounting stack | Two: the mount and the optic | Three: the rail, rail adapter/mount, and the optic | Front and rear sight |
| Optic height above bore | Lowest possible; varies depending on optic | Highest possible; height of picatinny rail plus height of rail mount/adapter and optic | No optic mounted |
| Interfaces that can shift under recoil | Two: optic to mount and mount to receiver | Three: optic to mount/adapter, mount/adapter to rail, and rail to receiver | Front and rear sight (unlikely); no optic mounted |
| Mounting hardware included | Receiver hardware and optic hardware both included | Varies by model and configuration | Not applicable |
Limitations to Know Before You Buy
- Three hole layout required: The mount fits Ruger® Mark™ Series models with the standard three hole layout. It does not fit model 40179 or vent rib models such as 43949. Check your model number before ordering.
- Optic footprint must be confirmed: The mount supports many popular optics from Vortex Optics®, Burris®, Trijicon®, Swampfox Optics, Holosun, and others, but not every footprint on the market. Use the compatibility chart linked on the product page to confirm your specific optic before ordering.
- Use a thread locker: The mounting screws should be installed with a thread locker and torqued carefully. Owners may experience screws backing out under repeated shooting when installed without thread locker, and over torquing small fasteners can strip the head of the screw.
- Division implications: When shooting in competitions like SASP, Rimfire Challenge, Steel Challenge, Metal Madness, or others, adding an optic can change which division your pistol is eligible for use within. Be sure to reference the rules of your particular league or range before making the decision to install an optic.
Technical Specifications
Construction
- Finish: Black anodized
- Body material: Aluminum
- Weight: 0.7oz without hardware (hardware depends on preferred optic)
- Mounting method: Direct to receiver using the factory three hole layout, no picatinny rail or clamp required; will only use two of the three mounting holes
- Hardware: Receiver mounting hardware and optic mounting hardware included
- Country of manufacture: USA
Compatibility
- Ruger® Mark IV™ Standard
- Ruger® Mark IV™ Tactical
- Ruger® Mark IV™ Target
- Ruger® Mark IV™ Hunter
- Ruger® Mark IV™ Competition
- Ruger® Mark IV™ 22/45™
- Ruger® Mark IV™ 22/45™ LITE
- Ruger® Mark IV™ 22/45™ Tactical
- Ruger® Mark III™ Standard
- Ruger® Mark III™ Target
- Ruger® Mark III™ Hunter
- Ruger® Mark III™ 22/45™
- Ruger® Mark III™ 22/45™ LITE
- Ruger® Mark III™ 22/45™ Target
- Ruger® Mark III™ 22/45™ Hunter
- Ruger® Mark™ I and Ruger® Mark™ II models that are factory drilled and tapped
Does not fit model 40179 or vent rib models such as 43949. TANDEMKROSS guarantees compatibility with factory Ruger® models in factory furniture and TANDEMKROSS original firearms. Compatibility with third-party receivers is not guaranteed.
Complete Package Includes
- Shadow Mount V3.0 for Ruger® Mark™ Series
- Hardware to attach the mount to the receiver
- Hardware to secure the optic to the mount
- Installation instructions available as a linked document on the product page
Shadow Mount V3.0 FAQs
What models are compatible with the Shadow Mount V3.0?
Yes, both are supported. The Shadow Mount V3.0 supports the Mark IV™ Standard, Tactical, Target, Hunter, and Competition along with the Mark IV™ 22/45™, 22/45™ LITE, and 22/45™ Tactical. Compatibility is determined by the receiver rather than the grip frame, which is why the same mount spans both the 1911 style 22/45™ frame and the standard Mark IV™ frame. The requirement is the standard three hole layout on top of the receiver. The Silencer Shop exclusive models (40179, 40181, 40182) and vent rib models such as 43949 are exceptions as they feature different hole patterns and are not compatible.
Does installing the Shadow Mount V3.0 require machining or permanent modification?
No, the Shadow Mount V3.0 does not require any machining, gunsmithing, or permanent modification. The mount uses mounting points already present on compatible receivers, so nothing needs to be drilled, tapped, milled, or permanently altered. Installation is easily done with the included hardware and tools. TANDEMKROSS provides written installation instructions plus an installation video on the product page. The pistol can be returned to its original configuration by removing the mount and reinstalling the factory hardware.
What factors help the Shadow Mount V3.0 maintain zero?
In practice, holding zero depends as much on installation technique as on the mount: use a thread locker on the mounting screws, torque them evenly, and verify zero at the range after any removal and reinstallation rather than assuming it. Owners who have installed the screws dry may experience them backing out under repeated shooting. Treat a zero check as part of the reinstallation process.
Which optics fit the Shadow Mount V3.0?
The Shadow Mount V3.0 accepts a wide selection of pistol red dots and reflex sights, including models from Vortex Optics®, Burris®, Trijicon®, Swampfox Optics, and Holosun. TANDEMKROSS publishes a compatibility chart on the product page so you can confirm your specific optic before ordering, which is the reliable step since footprints vary considerably even within a single brand's lineup. The mount ships with the hardware needed to secure the optic, so a standard installation does not require a separate mounting plate or hardware kit.
Legal and Compliance
No state level shipping restrictions apply to this product.
WARNING: This product can expose you to chemicals including chromium, which is known to the State of California to cause reproductive harm. For more information go to www.P65Warnings.ca.gov.
120 Reviews
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Shadow Mount 3.0
Great mount! I have used others in the past but this is the best !
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red dot mount
The mount is OK, seems well made, but doesn't full fit my Crimson Trace 1500 Lightweight Reflex Sight (J-Point/RMSc Compatible foot print), the 2 back screws work well, but the front posts do not line up, so they cannot be used. I do have it mounted, but I had to carefully tighten while making sure it is straight, having front posts that fit would guarantee it is straight I like that its further back on my pistol than other mounts, just wish it lined up better
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Works great
Works great with my Holosun 507. Had I not watched the install video, I would have been confused. Doesn't come with instructions.
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Shadow mount
Easy to install. Easy instructions. Solid build. Easy to mount site.
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Shadow mount
Great mount! Fit and finish awesome! Looks amazing!
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Shadow mount
Just finished mounting swamp fox sentinel on it , so again I haven’t shot the gun since installing, high quality, ease of installation, sits nice and low
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Very Easy to install
All required tools and screws were present with the kit. It took me longer to find and read the instructions than it did to install the plate. Very nice. Thank you.
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Shadow mount
High quality, almost a year of being holstered and shot through all terrains. I’ve shot in the freezing cold, rain and heat. I’m still driving tacs.. very good job TandemKross! Makes me want another Mark series’s pistol.
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Reddot mount
Excellent and well made perfect fit for my Holosun 507c
