Brownells Slide Assembly For Glock 43 With Holosun 407K Cut

The Brownells Slide Assembly for Glock 43 with Holosun 407K cut is purpose-built for shooters ready to modernize their compact EDC or build a custom pistol from the ground up. Whether you're upgrading a factory G43 or assembling a complete gun on a compatible frame, this slide delivers the optics-ready platform and refined controls serious shooters demand. Machined from 416 stainless steel and finished in durable black Nitride, it's engineered to accept factory and aftermarket barrels and internal components, giving you the flexibility to dial in exactly the gun you want.

The integrated Holosun 407K mounting slot lets you install a modern reflex sight with minimal footprint—no clunky adapters or workarounds. If you're not running a red dot yet, the included optic cover plate keeps the slot protected and the pistol looking clean. Factory front and rear iron sights are pre-installed, so you can use them as primary sights, backups to your optic, or both. Choose between the traditional solid top or the distinctive window cutout design. The window not only showcases a custom or ported barrel; it also aids cooling and allows venting from ported barrels to help manage recoil impulse—all while keeping your finished pistol compatible with standard Glock 43 holsters.

You'll notice the refined ergonomics immediately: wide, shallow cocking serrations at the rear and a mirrored set forward give you confident purchase from any grip angle, whether racking the slide or performing a press-check. It's the kind of detail that makes a custom build feel intentional and purpose-driven. The slide ships with a recoil spring assembly, so you're closer to a working gun right out of the box. Note that a channel liner (sold separately) is required for installation and will need a dedicated tool to press fit into place.

Key Features

• Holosun 407K reflex sight mounting slot—low-profile and secure
• Machined 416 stainless steel with black Nitride finish for durability and corrosion resistance
• Factory front and rear iron sights installed and ready to use
• Solid top or window cutout options for aesthetics and barrel cooling
• Dual cocking serration sets (rear and front) for confident slide manipulation
• Recoil spring assembly and optic cover plate included
• Fits Glock 43 factory frames and compatible aftermarket frames
• Accepts factory and aftermarket barrels and small parts

Specifications

Frequently Asked Questions

Will this slide work with my factory Glock 43 frame?

Yes. The Brownells slide is machined to Glock factory specifications and fits standard G43 factory frames as well as compatible aftermarket frames.

Can I use a different red dot sight, like an RMR?

The slide is cut for the Holosun 407K footprint. Adapter plates are available separately if you want to mount RMR-pattern optics instead.

What's included in the box?

The slide comes with a recoil spring assembly, factory front and rear iron sights pre-installed, and a lightweight polymer optic cover plate. A channel liner is required for installation but sold separately.

Can I use factory Glock barrels with this slide?

Yes. The slide is machined to accept factory Glock 43 barrels as well as quality aftermarket barrels, giving you flexibility to customize your build.