Image unavailable
Marksman V4 Slide For Gen 3 G21 - Marksman V4 Slide Gen 3 G21, 45 Acp, Black
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$299.95
View on Brownells
You'll be taken to Brownells to complete your purchase.
Hunter's Outpost earns a commission from affiliate links at no extra cost to you.
SKU: 100036531
Overview
Built for Gen 3 Glock G21 owners who want a more refined setup, this slide offers a custom option for a .45 ACP platform that is often overlooked. It is designed to accept a Trijicon RMR or Holosun 507 red-dot sight, making it a practical choice for shooters planning an optic-equipped handgun. The slide is machined from 416 stainless steel and finished with a DLC PVD treatment, with enhanced serrations adding to its functional design. For hunters and outdoorsmen who value a tailored sidearm, it provides a straightforward path to a cleaner, more specialized build.
Why Hunters Choose the Alpha Shooting Sports
Gen 3
Glock G21 models in .45
Clean Custom
Look for Glock G21 owners
Rear Milled
To accept Trijicon RMR or
Machined From
416 stainless steel for long-lasting
Finished Dlc
DLC PVD treatment for a
Key Features
- Custom slide designed for Glock G21 Gen 3 models.
- Built for .45 ACP Glock G21 customization.
- Machined from 416 stainless steel.
- Rear milled to accept Trijicon RMR or Holosun 507 red-dot sights.
- Finished with DLC PVD treatment.
- Enhanced serrations for improved slide manipulation.
Best Used For
- Glock G21 Gen 3 owners wanting a custom slide for a cleaner, personalized setup
- Shooters planning to mount a Trijicon RMR or Holosun 507 red-dot sight
- .45 ACP users looking to update an OEM G21 with a purpose-built slide
- Builders focused on a black-finished slide for a streamlined Glock customization project
Specifications
| Blade Finish | DLC PVD treatment |
|---|---|
| Caliber | .45 ACP |
| Color | Black |
| Compatible Model | Glock G21 Gen 3 |
| Material | 416 stainless steel |
| Optic Cut | Trijicon RMR or Holosun 507 |
| Serrations | Enhanced serrations |
Pros
- Designed specifically for Gen 3 Glock G21 models in .45 ACP
- Provides a clean custom look for Glock G21 owners
- Rear milled to accept Trijicon RMR or Holosun 507 red-dot sights
- Machined from 416 stainless steel for long-lasting performance
- Finished with DLC PVD treatment for a refined black appearance
- Enhanced serrations improve slide handling and manipulation
Considerations & Trade-offs
- Designed specifically for Gen 3 Glock G21 pistols, so it is not a universal slide and won’t fit other Glock models without the correct platform match.
- The slide is cut for Trijicon RMR or Holosun 507 optics, which is useful for red-dot setups but means it is not a plain, non-optics-ready slide.
- This is a slide-only component, so it is intended for owners building or replacing a compatible upper rather than anyone looking for a complete firearm part set.
- The black DLC PVD finish and custom styling may appeal to a purpose-built setup, but it is a more specialized choice than a standard OEM slide.
Suggested Comparisons
- Glock G21 slide upgrades
- Red-dot optic-ready handgun slides
- Custom pistol slide components
- Gen 3 Glock 21 replacement parts
Suggested Accessories
- Red-dot sight
- Glock G21 Gen 3 compatible barrel
- Recoil spring assembly
- Slide completion parts kit
Frequently Asked Questions
What Glock model is this slide made for?
It is designed for use with Gen 3 Glock G21 models.
Is this slide cut for a red-dot optic?
Yes. The rear of the slide is milled to accept a Trijicon RMR or a Holosun 507 red-dot sight.
What material is the slide made from?
The slide is machined from 416 stainless steel.
What finish does the slide have?
It is finished with a DLC PVD treatment.
Does the product mention any special slide features?
Yes. The description notes enhanced serrations, but it does not provide additional detail.