Description
This precision-engineered steel adapter plate bridges Glock’s MOS system with Holosun’s compact K-series red dots for seamless optic mounting.
Transform your Glock MOS pistol into an optics-ready platform for compact red dot sights without expensive slide milling. This factory adapter plate eliminates compatibility barriers between Glock’s Modular Optic System and Holosun’s popular 407K and 507K micro red dots, providing a secure and stable mounting solution. The steel construction ensures durability under recoil, while the included mounting hardware makes installation straightforward for shooters seeking enhanced target acquisition on their carry or duty pistols.
Key Features
- Steel Construction: Manufactured from steel for superior strength and long-term durability under pistol slide recoil forces
- Direct MOS Compatibility: Designed specifically to fit Glock MOS pistol slides without modification or additional adapters
- K-Series Footprint: Accepts Holosun 407K and 507K red dot sights
- Complete Hardware Included: Comes with all necessary mounting screws for secure installation on both the slide and optic
Important Compatibility Notes
Compatible Glock Models (MOS Only):
- Full-size MOS: G17, G20, G21, G22, G34, G40, G41, G47
- Compact MOS: G19, G26, G45
NOT Compatible With:
- Glock 43X MOS or G48 MOS (these slimline models use a different RMSc footprint and mounting pattern)
- Standard non-MOS Glock pistols
- Holosun 407C, 507C, 508T, or 509T (these use the larger C-series footprint, requiring different plates)
Compatible Optics:
- Holosun 407K-X2
- Holosun 507K-X2
- Other optics using the Holosun K-series footprint
Why We Carry It
The Glock MOS system revolutionized pistol optics mounting when introduced, but Glock’s included adapter plates initially focused on larger optic footprints. As compact carry optics like the 407K and 507K gained popularity for concealed carry, the need for proper adapter plates became clear. Holosun addressed this gap by engineering the KPLT-MOS9MM specifically for their K-series micro red dots. We stock this adapter because it solves a specific problem for shooters who want the benefits of a compact optic on their full-size or compact MOS Glock without compromising on mounting security or requiring permanent slide modifications.
Frequently Asked Questions
Will this adapter work with my Glock 43X MOS or 48 MOS?
No. The Glock 43X and 48 use a different slimline MOS configuration with an RMSc footprint that includes recoil lugs. Those models require either a different adapter plate or direct mounting, depending on your specific optic. This KPLT-MOS9MM plate is designed exclusively for standard MOS models like the G17, G19, G26, G34, and G45.
Is steel better than aluminum for an adapter plate?
Steel offers superior strength, thread engagement, and resistance to wear compared to aluminum adapter plates. While aluminum plates are lighter, the weight difference on a pistol slide is negligible. Steel’s higher tensile strength and resistance to thread stripping make it the preferred choice for applications involving repeated recoil forces, which is why Holosun manufactured this plate from steel rather than aluminum.
Can I use this plate with my Holosun 507C or 508T?
No. This plate is specifically designed for the K-series footprint used by the 407K and 507K. The 507C, 508T, and other C-series Holosun optics use the larger RMR footprint and will mount directly to the standard MOS adapter plate that comes with your Glock. The K-series optics are significantly smaller and use a modified RMSc mounting pattern.
Spec Sheet
- Manufacturer: Holosun Technologies
- Model: KPLT-MOS9MM
- UPC: 810047071136
- Material: Steel
- Finish: Black
- Compatible Optics: Holosun 407K, 507K (K-Series footprint)
- Compatible Firearms: Glock MOS models (full-size and compact; excludes 43X/48)
- Included: Mounting hardware (screws)
- Type: Optic adapter plate
