Description
This low-profile slide mount from Shield Sights is designed for Glock 21 slides and enables mounting RMSc-style optics without the need to mill or cut the slide. The mount replaces the rear iron sights and installs as a slide-in rear sight with an integrated mount plate. It sits flush with RMSc and SMSc optics and is compatible with several other RMS-family footprints with some fit considerations. The design provides a discrete mounting solution while preserving the slide profile.
Key Specifications
- The manufacturer is Shield Sights.
- Designed to fit Glock 21 slides by replacing the rear iron sights.
- Allows installation of RMSc-style optics without milling the slide.
- Sits flush with RMSc and SMSc optics.
- Also fits RMS, SMS, SMS2, and Jpoint with a slight width overhang.
- The RMSw may fit but may not seal due to a narrower plate and gasket.
- It installs as a slide-in rear sight and mount plate.
- The finish color is Black.
- The product type is listed as a Mount.
- The subcategory is Optic Specific Mounts.
Practical and unobtrusive, this Shield Sights low-profile mount provides a straightforward solution for adding RMSc-style red dot optics to a Glock 21 without permanent slide modification. Its compatibility with multiple RMS-family footprints and a flush sit with RMSc/SMSc make it a sensible choice for shooters who want a clean, minimalist optic installation that retains the slide’s original appearance.






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