Glock 19 Gen 4 MOS Slide

Upgrade your Glock with the Glock 19 Gen 4 MOS OEM Slide — a factory slide milled for direct optic mounting, giving you a faster sight picture and true co-witness capability. Built on the proven Gen 4 platform, this slide combines Glock’s dependable internals with modern red-dot compatibility.

Product Description | Specs for Glock 19 Gen 4 MOS OEM Slide

Glock machines this slide from high-strength steel and applies a durable factory finish for long-lasting wear and corrosion resistance. The defining feature of the Gen 4 MOS slide is its Modular Optic System cutout, which accepts a range of mounting plates for popular micro red-dot sights. Built on the trusted Gen 4 platform, it retains Glock’s dual recoil spring assembly and updated grip texture compatibility for reliable, repeatable performance.

What’s Included — Complete OEM Slide

• Glock 19 Gen 4 MOS slide (fully assembled)
• Non-ported Glock barrel (model-specific, 9mm)
• Dual recoil spring assembly (Gen 4 style)
• Extractor
• Firing pin assembly & firing pin safety
• Depressor plunger assembly
• Rear slide plate (Gen 4 style)
• Channel liner
• Factory front & rear sights (suppressor-height compatible cut)
• Optic mounting plates (assorted, MOS kit)

What’s Included — Stripped OEM Slide

• Glock 19 Gen 4 MOS stripped slide
• Channel liner
• Factory front & rear sights
• Optic mounting plates (assorted, MOS kit)

Note: Stripped slides do not include barrel, RSA, or upper internal components.

Specifications

• Model: Glock 19 Gen 4 MOS OEM Slide
• Material: Hardened steel
• Finish: Black (factory finish)
• Slide Length: Compact (Glock 19 length)
• Slide Width: Approx. 1.00 in (25.5 mm)
• Caliber: 9mm Luger
• Porting: No — standard (non-compensated) slide
• Optic Ready: Yes — MOS (Modular Optic System)
• Serrations: Front & rear (Gen 4 standard pattern)

How to Disassemble a Glock 19 Gen 4 MOS Slide

1. Ensure the firearm is unloaded and remove the magazine.
2. Pull the slide slightly rearward and depress both takedown levers.
3. Release the slide forward and lift it off the frame.
4. Remove the dual recoil spring assembly.
5. Lift the barrel out of the slide.

Now the slide is ready for cleaning, inspection, or maintenance.

How to Install a Glock Slide

1. Insert the barrel into the slide.
2. Seat the dual recoil spring assembly against the barrel lug.
3. Align the slide on the frame rails.
4. Pull the slide fully rearward and release to lock it in place.
5. Perform a full function check before use.

Compatibility

This slide fits Glock 19 Gen 4 frames and Gen 4-compatible components. It is not directly compatible with Gen 3 or Gen 5 frames without modification. The MOS cutout accepts Glock’s optic mounting plate kit, which supports most common micro red-dot footprints.

Materials & Finish

Constructed from hardened steel and finished with Glock’s durable coating, this slide is built to withstand extended use. The MOS cutout is precision-machined for a secure, repeatable optic mount without sacrificing slide durability.

Customization Options

• Sights: Upgrade to night sights or fiber-optic options; suppressor-height sights recommended for co-witness with an optic
• Finish: Apply Cerakote or custom coatings (may affect warranty)
• Optic Plates: Use the correct mounting plate for your specific red-dot footprint
• Engraving: Professional engraving or customization available

FAQs

Q: What does “MOS” mean? A: MOS stands for Modular Optic System — a factory-milled cutout that lets you mount a red-dot sight directly to the slide using interchangeable plates.

Q: Do I need a specific barrel for this slide? A: No — unlike the 19C, this slide uses a standard (non-ported) barrel, so any compatible Gen 4 Glock 19 barrel will work.

Q: Is this slide compensated/ported? A: No — this is a standard MOS slide without factory porting.

Q: Does the complete slide include mounting plates for my optic? A: Yes — the complete version ships with an assortment of mounting plates to fit common micro red-dot footprints; confirm your specific optic’s plate compatibility before purchase.