Glock 31 Gen 4 OEM Slide

The Glock 31 Gen 4 OEM Slide delivers factory-built durability and .357 SIG performance for shooters who rely on genuine OEM precision. Engineered specifically for the Glock 31 Gen 4 platform, this slide offers reliable cycling, consistent accuracy, and the rugged nDLC coating trusted by duty and defensive shooters. Because it is built to Glock standards, it ensures perfect compatibility and long-term dependability for restoration, upgrades, or full OEM builds.

Product Description | Specs for Glock 31 Gen 4 OEM Slide

Glock machines the 31 Gen 4 slide from high-strength steel and applies the tough black nDLC finish for exceptional corrosion resistance. The Gen 4 design includes enhanced recoil management features and improved frame-to-slide interface for smoother function. Built for the high-pressure .357 SIG cartridge, this slide maintains excellent strength and stability during rapid fire.

What’s Included for Complete OEM Slide:

• Glock 31 Gen 4 complete slide
• Factory OEM .357 SIG barrel
• Recoil spring assembly (dual RSA – Gen 4)
• Extractor
• Firing pin safety
• Depressor plunger assembly
• Firing pin assembly
• Rear slide plate
• Channel liner
• Fixed factory sights

Stripped OEM Slide:

• Glock 31 Gen 4 stripped slide
• Channel liner
• OEM sights

Note: The stripped slide does not include the barrel, RSA, or internal components.

Specifications

• Model: Glock 31 Gen 4 OEM Slide
• Caliber Platform: .357 SIG
• Finish: Black nDLC
• Length: 7.32 inches
• Width: 1.00 inch
• Weight (without barrel/RSA): Approximately 6.70 oz
• Optic Ready: No (non-MOS factory slide)
• Compensated Ports: No
• Generation: Gen 4 specific

How to Disassemble a Glock 31 Gen 4 OEM Slide

1. Ensure the firearm is unloaded and remove the magazine.

2. Pull the slide slightly rearward and pull down the takedown levers.

3. Release the slide forward off the frame.

4. Remove the recoil spring assembly.

5. Lift out the barrel.

Your slide is now ready for maintenance, inspection, or upgrades.

 How to Install a Glock Slide

1. Insert the barrel into the slide.

2. Install the dual recoil spring assembly onto the barrel lug.

3. Align the slide with the frame rails.

4. Pull the slide fully rearward and release.

Always perform a function check after installation.

Compatibility with Other Models

The Glock 31 Gen 4 OEM Slide is only compatible with:

• Glock 31 Gen 4 frames
• Glock 22 Gen 4 frames (with caliber-appropriate barrel swap)
• Glock 35 Gen 4 frames (with correct barrel length & RSA)*

Not compatible with:

• Gen 3 or Gen 5 frames
• Glock 17, 19, 45, 23, or other 9mm/.40 models
• Any non-Gen-4 RSA system

*Long-slide fitment may require build-specific modifications.

What Are Glock 31 Gen 4 OEM Slides Made Of?

Glock machines this slide from heat-treated steel to withstand the higher pressures of the .357 SIG cartridge. The nDLC (diamond-like carbon) finish increases corrosion resistance, reduces surface friction, and helps the slide remain reliable in extreme environmental conditions.

 Customization Options

• Sights: Install night sights, fiber-optic sights, or suppressor-height sights.
• Finish: Apply Cerakote for color customization and added protection.
• Engravings: Add custom text, logos, or unique slide artwork.

FAQs

Q: Does this slide include internal components?
The complete slide includes all internals. The stripped slide does not.

Q: Is this slide optics-ready?
No, this is a non-MOS OEM slide without an optic cut.

Q: Can I convert calibers with this slide?
Yes — you may convert to .40 S&W with a Glock 22 Gen 4 barrel & RSA.
You may convert to 9mm only with aftermarket conversion barrels.

Q: Will this slide fit Gen 3 or Gen 5 frames?
No, this slide is Gen 4-exclusive.

Q: What makes the nDLC finish beneficial?
It enhances durability, corrosion resistance, and reduces glare.

DISCLAIMER

Factoryglockslides.com provides aftermarket and compatible slides and components for GLOCK pistols. We operate independently and do not represent, endorse, or have any connection with GLOCK, Inc. or GLOCK Ges.m.b.H.
GLOCK, Inc. and GLOCK Ges.m.b.H own the trademark “GLOCK” and other related marks. We mention “GLOCK” only to identify parts and products that fit or work with GLOCK pistols.

Best Upgrades for Glock 31 Gen 4 Slide

Upgrading a Glock 31 Gen 4 slide improves speed, sight picture, and recoil control for the .357 SIG platform. Because this caliber is high-pressure, choosing the right upgrades increases reliability while boosting performance.

Popular upgrades include:
• Fiber-optic or night sights
• Extended slide lock lever
• Aftermarket Cerakote finish
• Enhanced extractor for .357 SIG

Converting Glock 31 Gen 4 to .40 S&W

The Glock 31 Gen 4 slide allows easy caliber conversion to .40 S&W using a factory Glock 22 Gen 4 barrel. This setup maintains OEM reliability while giving shooters access to a more affordable caliber without changing the entire upper assembly.

Conversion requires:
• Glock 22 Gen 4 .40 S&W barrel
• Standard Gen 4 RSA
• Compatible .40 S&W magazines