Glock OEM Gen MOS Spare Slide

Glock OEM Gen MOS Spare Slide

The Glock OEM Gen MOS Spare Slide is a genuine factory-original slide featuring Glock’s Modular Optic System (MOS) cut. Designed specifically for Gen 3 frames, this slide allows you to mount a red dot optic without custom machining — using the included MOS adapter plate system. It’s the factory solution for adding optics capability to Gen 3 pistols, California-compliant builds, or Polymer80 projects.

Genuine Glock OEM Part

This is not an aftermarket clone. It’s manufactured by Glock to factory specifications (manufacturer part numbers 79008 for G19, 79009 for G17, or 79011 for G34) [citation:21][citation:31]. You get the same slide Glock puts on factory MOS-configured pistols, with no compatibility guesswork. Glock OEM parts are made with the same attention to detail and quality as the ultra-reliable pistols [citation:20].

Factory MOS Cut for Direct Red Dot Mounting

The factory-cut MOS configuration allows for direct mounting of optics using the included adapter plates — no custom machining required [citation:32]. The MOS system supports popular full-size red dot footprints including Trijicon RMR, Holosun 507C, Leupold DeltaPoint Pro, and more. Glock’s MOS system sets the bar for adaptable optics cuts — it’s versatile enough to fit most red dot footprints with the appropriate adapter plate and sits low enough for co-witness with standard suppressor-height sights [citation:25].

Key Features and Benefits

High-Strength Steel Construction

Glock manufactures this slide from high-strength steel and coats it with a durable, corrosion-resistant finish for long-lasting performance [citation:32]. The nDLC finish reduces friction, enhances durability, and minimizes reflection even in harsh environments.

Available Configurations

Compatible Red Dot Optics

Confirmed Compatible Optics — Via Factory MOS Adapter Plates

• Trijicon RMR / SRO
• Holosun 507C / 508T / 509T
• Leupold DeltaPoint Pro
• Vortex Venom / Viper
• Sig Sauer Romeo1 Pro
• Other RMR-footprint optics

For full technical specs on each optic, visit the manufacturer pages: Trijicon RMR · Holosun 507C · Leupold DeltaPoint Pro.

Ideal For These Applications

How to Mount Your Red Dot Optic

1. Remove the MOS cover plate by backing out the retaining screws.
2. Identify the correct adapter plate for your optic from the included MOS plate set.
3. Attach the adapter plate with a small drop of Blue Loctite on each screw.
4. Mount your optic to the adapter plate and torque to spec (typically 10–15 in/lbs).
5. Apply witness marks and bore-sight or live-fire zero at your intended distance.

Fit and Compatibility

Holster Compatibility

Standard Glock 17, 19, or 34 Gen 3 holsters fit this slide. Because the slide is MOS-cut, holsters must provide clearance for a mounted optic. Standard holsters without optic clearance will not correctly fit this slide with an optic installed.

Care and Maintenance Guide

Frequently Asked Questions

Technical Information

Q: What recoil spring does this slide require? A: Use a Gen 3 single recoil spring assembly. Gen 4 and Gen 5 dual recoil springs are not compatible [citation:32]. Q: Are the included sights night sights (tritium)? A: No. The standard configuration ships with factory steel sights. Night sights are available as an upgrade. Q: Is this a genuine Glock part? A: Yes. This is a factory Glock OEM part with manufacturer part numbers 79008, 79009, or 79011 depending on model [citation:21][citation:31].

Ordering and Support

Q: What payment methods do you accept? A: We accept all major credit cards, PayPal, and Apple Pay for secure checkout. Q: Do you offer a law enforcement or military discount? A: Yes. Verified law enforcement, military, and EMS personnel receive a discount. Contact us before ordering to verify eligibility. Q: How long does shipping take? A: Most orders ship within 2–3 business days. Continental US delivery typically takes 3–5 business days after shipping. International orders usually arrive in 7–14 business days after shipping.

Why Choose the Glock OEM Gen 3 MOS Spare Slide

Add to Cart Options

– Complete Glock OEM Gen 3 MOS Spare Slide Assembly – From $239.99 – Stripped Glock OEM Gen 3 MOS Spare Slide – From $239.99 📦 Free Shipping on Orders Over $300 🔒 Secure SSL Checkout ⚡ Ships Within 2–3 Business Days Related Products: Glock 17 Gen 3 OEM Slide – Standard non-MOS Gen 3 slide Glock 19 Gen 3 OEM Slide – Compact Gen 3 slide Glock 19 Gen 4 MOS OEM Slide – Gen 4 optics-ready version Shop All MOS & Optics-Ready Slides Explore Related: Glock 17 Slides · Glock 19 Slides · Glock MOS Slides · All Glock Slides For official Glock maintenance and armorer guidance, see Glock’s official resource page. For information on optics-ready pistol regulations in California, see California DOJ Firearms Bureau.