Glock 43X MOS Slide

Upgrade your Glock with the Glock 43X MOS OEM Slide — a slim, single-stack, factory slide milled for direct optic mounting. Combining the 43X’s discreet carry profile with modern red-dot compatibility, this slide gives concealed carriers a faster sight picture without sacrificing concealability.

Product Description | Specs for Glock 43X MOS OEM Slide

Glock machines this slide from high-strength steel and applies a durable finish for long-lasting wear and corrosion resistance. The defining feature of the 43X MOS slide is its Modular Optic System cutout, which accepts a range of mounting plates sized for the slim single-stack platform, allowing popular micro red-dot sights to mount directly to the slide.

What’s Included — Complete OEM Slide

• Glock 43X MOS slide (fully assembled)
• Glock barrel (model-specific, 9mm)
• Dual recoil spring assembly
• Extractor
• Firing pin assembly & firing pin safety
• Depressor plunger assembly
• Rear slide plate
• Channel liner
• Factory front & rear sights (suppressor-height compatible cut)
• Optic mounting plates (assorted, MOS kit)

What’s Included — Stripped OEM Slide

• Glock 43X 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 43X MOS OEM Slide
• Material: Hardened steel
• Finish: Black (factory finish)
• Slide Length: Compact (Glock 43X length)
• Slide Width: Approx. 1.02 in (26 mm)
• Caliber: 9mm Luger
• Porting: No — standard (non-compensated) slide
• Optic Ready: Yes — MOS (Modular Optic System)
• Serrations: Front & rear

How to Disassemble a Glock 43X 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 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 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 43X frames and slim-frame compatible components. It is not compatible with standard-width Glock frames (such as the Glock 19 or Glock 26) without modification, as the 43X uses a narrower single-stack slide and frame profile. The MOS cutout accepts Glock’s slim-profile optic mounting plate kit, supporting common micro red-dot footprints sized for the platform.

Materials & Finish

Constructed from hardened steel and finished with Glock’s durable coating, this slide is built to withstand extended daily carry use while maintaining a slim, print-resistant profile. 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 a red dot
• 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 on the Glock 43X? A: MOS stands for Modular Optic System — a factory-milled cutout that lets you mount a compact red-dot sight directly to the slide using interchangeable plates sized for the slim platform.

Q: Will this slide fit my Glock 19 or Glock 26? A: No — the 43X uses a narrower single-stack slide and frame profile that is not interchangeable with standard-width Glock models.

Q: Can I run a red dot on a slim carry gun like the 43X? A: Yes — the MOS slide is factory-cut for optic mounting, making it a popular choice for concealed carriers who want a red dot without stepping up to a wider double-stack slide.

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.