Finally — a slim, stainless-steel optics mounting solution for OEM (non-MOS) Glock dovetail slides that lets you fit RMSc-footprint red-dot optics without cutting your slide.
Compatible Glock models (OEM dovetail, non-MOS): 17, 19, 19X, 20, 21, 22, 23, 24, 26, 27, 29, 30, 30SF, 34, 36, 42, 43, 43X, 45, 48.
Does NOT fit Glock 44.
The Cross Armory Rear Sight Dovetail → RMSc Mount Adapter replaces your factory rear dovetail and provides a low-profile RMSc mounting platform plus a bright green fiber-optic co-witness front sight — all in a single, precision-machined 17-4 stainless steel unit with a durable black nitride finish. Optic not included.
Convert your OEM (non-MOS) Glock dovetail into a secure RMSc optics platform with Cross Armory’s precision Rear Sight Dovetail → RMSc Mount Adapter. Machined from 17-4 stainless steel and finished in black nitride, this mount integrates a rear sight and comes with a bright green fiber-optic front sight pre-installed for rapid acquisition. Sights are tall for co-witnessing with most RMSc-footprint red dots, providing a reliable backup if your optic fails. Includes dovetail installation tools — no slide cutting required. Use the mounting screws supplied with your optic. Designed for OEM Glock (non-MOS) slides. Does not fit Glock 44. Installation must be performed by a licensed gunsmith or qualified armorer.
What’s included
- Cross Armory RMSc mounting plate with integrated rear iron sight
- Bright green fiber-optic front sight and screw
- Installation tools and hardware for dovetail removal/installation (punch rod and hex wrench)
Key features
- Slim, low-profile 17-4 stainless steel construction for strength and longevity
- Black nitride finish for corrosion and wear resistance
- Integrated rear sight — replaces factory dovetail with a secure optics plate
- Bright green fiber-optic front sight (installed) for rapid target acquisition
- Tall, co-witness iron sights — sights sit at a height to provide co-witnessing with most RMSc-footprint red dots for reliable red-dot backup
- Designed to accept most RMSc-footprint micro red dots while remaining compatible with many optic-ready holsters
Examples of compatible optics
(verify footprint and clearance for your optic)
- Swampfox Sentinel
- Holosun 407K / 507K (RMSc variants)
- SIG Romeo Zero / Romeo Zero Elite
- Shield Sights RMS / RMSc optics
- Hex Optics Wasp
- Crimson Trace CT-1550
Important fitment & installation notes — PLEASE READ
- Optic not included. Confirm your optic uses an RMSc footprint.
- Use the mounting screws provided with your optic to attach the optic to this adapter.
- Thinner-bodied optics may sit closer to the plate; verify clearance before final installation.
- Designed for OEM Glock (non-MOS) slides. Aftermarket slides or slides with non-standard dovetail geometry may require additional gunsmithing or modification.
- Some aftermarket slides use tapered dovetails (one side tighter than the other). If a licensed gunsmith must use more than a few sharp taps to seat or remove the unit, stop and verify slide geometry and installation direction — excessive force can damage the firearm or the adapter.
- Installation must be performed by a licensed gunsmith or qualified armorer. Improper installation can cause damage or unsafe operation.
Compatibility reminder
This adapter maintains a slim profile and fits many optic-ready holsters, but holster compatibility should be confirmed with your chosen optic mounted.
| Specification | Details |
|---|---|
| Material | 17-4 Stainless Steel |
| Finish | Black Nitride |
| Front Sight | Green Fiber-Optic (Co-Witness Height) |
| Rear Sight | Integrated (Co-Witness Height) |
| Fit | OEM Glock Dovetail (Non-MOS) |
| Compatible Optics | RMSc Footprint Red Dots (e.g., Swampfox Sentinel, Holosun 407K/507K, Sig Romeo Zero, Shield RMSc, Hex Wasp, Crimson Trace CT-1550) |
| Product Dimensions | 0.5″ x 3.5″ x 5.5″ |
| Weight | Adapter Only – 0.7oz |
| All parts and tools in packaging – ~2.8 oz | |
| UPC | 740588596464 |
| Country of Origin | USA |
| Installation | Gunsmith Recommended / DIY Possible |
DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.
“GLOCK” is federally registered Glock, Inc. or Glock Ges.m.b.H
Cross has NO affiliation in any manner with, or otherwise endorsed by, Glock, Inc. or Glock Ges.m.b.H. The use of the word “GLOCK” on this page is merely to identify with which firearm these parts or components are compatible.
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