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GLOCK MOS Adapter Plate Series Guide – Compare OEM Options for Your Optic & Slide

Overview
Looking to mount a red dot sight on your GLOCK MOS pistol? The OEM GLOCK MOS Adapter Plate Series offers a precision-engineered solution for securely attaching optics without custom milling or aftermarket guesswork. Whether you're installing a Trijicon®, Holosun®, Leupold®, or Shield® red dot, choosing the right plate ensures perfect fitment, repeatable accuracy, and compatibility with your slide's width.

This guide breaks down each GLOCK MOS adapter plate (01–08), explaining what optic footprints they support and which GLOCK Gen4 or Gen5 models they fit best.

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🔍 Which GLOCK MOS Adapter Plate Do You Need?

Step 1: Identify Your Slide Width

• 25.5 mm (1.00 inch): Found on G17 Gen5 MOS, G19 Gen5 MOS, G34 Gen5 MOS, G45, and G47

• 27.5 mm (1.08 inch): Found on G20 Gen5 MOS, G21 Gen5 MOS, G22 Gen5 MOS, G23 Gen5 MOS, G35 Gen5 MOS, G40 Gen5 MOS

Step 2: Match Your Optic’s Mounting Footprint to the Plate

Plate #	Compatible Optic Footprints	Slide Width	Common Optics
01	Docter / Meopta / Insight / Vortex	25.5 mm	Vortex Venom®, Burris FastFire®
02	Trijicon RMR / Ameriglo / Holosun (not 509)	25.5 mm	Trijicon RMR®, Holosun 507C, 508T
04	Leupold DeltaPoint / EOTech / Shield RMS	25.5 mm	Shield RMS®, DeltaPoint® Pro
05	Docter / Meopta / Insight / Vortex	27.5 mm	Burris FastFire®, Meopta, Insight
06	Trijicon RMR / Ameriglo / Holosun (not 509)	27.5 mm	RMR®, 507C, 508T, Ameriglo Haven®
08	Leupold DeltaPoint / EOTech / Shield RMS	27.5 mm	RMS, MRDS, DeltaPoint® Pro

💡 Plates 03 and 07 are blanks or reserved for proprietary fits and are not commonly used in civilian applications.

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🛠️ What’s Included in an OEM GLOCK MOS Adapter Set?

• (4) Adapter Plates (usually Plates 01, 02, 04, 05 or 06/08 depending on slide width)

• Mounting screws

• Hex wrench

• Instruction sheet

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🧰 Installation Specs

• Torque: 13.1 in-lbs (1.5 Nm)

• Threadlocker Recommended: Yes (e.g., Loctite® Blue)

• Cleaning: Use a dry cloth; light oil on contact surfaces

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📌 Related Internal Links

• Explore individual GLOCK MOS Adapter Plates (01–08) — Compare Plate 01, 02, 04, 05, 06, and 08 to find the perfect fit for your optic and slide width.

• GLOCK Optic Footprint Compatibility Guide — See which red dot brands (Docter, Trijicon, EOTech, Shield, Vortex) correspond to each MOS plate.

• GLOCK Red Dot Mounting Accessories — Shop MOS accessories, screws, and direct-mount options customized for Gen4 and Gen5 slides.

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❓ Frequently Asked Questions

Q: How do I choose the right GLOCK MOS Adapter Plate?
A: Match your slide width (25.5 mm or 27.5 mm) to the optic's footprint. Refer to the chart above for common optic compatibility by plate number.

Q: Are these plates compatible with all GLOCK MOS pistols?
A: These plates are designed for Gen5 and Gen4 MOS models. Always confirm your slide width and optic type before installation.

Q: Can I co-witness with my iron sights?
A: Yes, many shooters achieve co-witness setups using suppressor-height iron sights, depending on the optic and plate used.

Q: What torque should I use for the mounting screws?
A: GLOCK recommends torquing to 13.1 in-lbs (1.5 Nm) with threadlocker applied.

Q: Are the adapter plates sold individually or in a set?
A: You can buy full MOS Adapter Plate Sets or individual plate numbers depending on your optic and needs.