C-More Ruger MKII, MKIII, MKIV, 22/45 Mounting Kit For STS, STS2, RTS2

• Ruger-specific fit: This mounting kit is made for Ruger Mk II, Mk III, Mk IV and 22/45 pistols, giving these rimfire handguns a direct path to a compact C-More optic without improvised adapters.
• C-More RTS/STS interface: The mount uses the C-More RTS/STS mounting standard, so it is suited to STS, STS2 and RTS2-pattern micro red dot sights and keeps the installation within the C-More ecosystem.
• Rear-sight replacement design: The adapter plate works with a dovetail insert that replaces the factory rear sight, which simplifies installation on compatible pistols and avoids permanent modification for many users.
• 0 MOA alignment: With 0 MOA inclination, the mount keeps the optic level with the pistol’s bore line, which suits typical rimfire target shooting and general-use zeroing distances.
• Includes mounting screws: The kit comes with the required mounting screws, so the key hardware needed to attach the optic to the mount is already part of the package.

About the C-More MRD Mounts Series

C-More MRD Mounts are built around the company’s miniature red dot sight footprint and give shooters a way to install compact optics on a wide range of firearms and mounting surfaces. In C-More’s lineup, this family supports the brand’s micro reflex sights rather than full-size competition bodies, making it relevant to users who want a smaller, lighter optic package for pistols, carbines and other platforms. The series includes firearm-specific mounting kits as well as rail, dovetail and other interface options, so the emphasis is on matching the sight to the host firearm correctly rather than relying on one universal plate.

Within the range, compatibility commonly centers on STS, STS2 and RTS2-pattern sights, with certain mounts also serving related models depending on the exact design. That makes the series especially useful for shooters who already use C-More miniature red dots and want to move within the same mounting standard. The overall design approach is practical: compact adapters, application-specific geometry and straightforward installation hardware for target pistols, optic-ready handguns and rail-equipped firearms. For rimfire pistols and similar hosts, these mounts provide a stable base for a red dot sight while preserving a low, clean setup.

About the C-More Ruger MKII, MKIII, MKIV, 22/45 Mounting Kit For STS, STS2, RTS2

The C-More MT-503 is a handgun red dot sight mount made specifically for Ruger Mk II, Mk III, Mk IV and 22/45 pistols. Its purpose is straightforward: it allows an STS2 or RTS2 sight to be installed on these popular rimfire handguns using a dedicated interface rather than a generic adapter. For shooters using a Ruger target pistol for range work, steel shooting or small-game-oriented rimfire setups, that model-specific fit matters because it helps keep the optic properly positioned and mechanically consistent.

The mount follows the C-More RTS/STS standard, which makes it a natural choice for users already invested in C-More miniature reflex sights. C-More describes the system as using an adapter plate that attaches to a dovetail insert replacing the factory rear sight. In practical terms, that gives compatible Ruger pistols a clean way to accept a micro red dot without changing the character of the handgun with bulky add-on hardware. The 0 MOA inclination suits normal pistol zeroing distances, while the black finish keeps the mount visually unobtrusive on target and field pistols alike.

Because this is a firearm-specific mounting kit rather than a universal plate, its main advantage is fit and application focus. It is intended for shooters who want a compact C-More optic on a Ruger rimfire platform with the correct footprint and the necessary mounting screws already included. That makes it a practical solution for building a tidy, dedicated red dot setup on the Mk-series platform.

About C-more

C-MORE Systems has offered sights since 1993 and is based in Warrenton, Virginia, United States. The company is known primarily for sighting systems, with a product range centered on red dot sights and rifle scopes. Its miniature red dot lineup includes the RTS2, STS2, RTS3 and CRC, while other well-known C-More sight families include the Railway, Slide Ride and Serendipity models.

That product focus is relevant here because C-More does not only make optics; it also produces mounting hardware for its sights, allowing users to stay within one footprint and one brand ecosystem when configuring a firearm. Alongside its reflex sights, the company also offers the C3 1-6x24 rifle scope, showing that its expertise extends across both compact electronic sights and magnified shooting optics. For products such as the MT-503, that specialization translates into mounts designed around the dimensions and interfaces of C-More’s own miniature red dot sights.

Main Features

• Manufacturer: C-more
• Mount series: C-More MRD Mounts
• Mount standard: C-More RTS/STS
• Compatibility: C-More RTS Mounting Standard
• Inclination: 0 MOA
• Extension (KR): KR 0.0 mm
• Color: Black

Warranty

2 years. C-More states a 2-year warranty for this mounting kit, making the coverage period clear for this product.

In the Box

• Mounting kit
• Mounting screws