The Brownells Premium Window Slide for Glock 43 with Holosun 407K cut is a stripped replacement slide built for shooters and builders ready to modernize a compact carry gun with a red-dot optic. This stainless steel slide arrives as a bare upper—no internals, sights, or barrel—giving you complete control over how you assemble your pistol. The windowed design lightens the slide and exposes the barrel for a custom look, while the Holosun 407K cut means your optic mounts directly without any guesswork or expensive slide trips to a gunsmith.

Built for the Glock 43 frame, this slide combines heat-treated stainless steel with a black nitride finish that resists corrosion and handling wear. Front and rear angled serrations give you solid purchase for press checks and malfunction drills, whether you're training hard or carrying daily. The stripped format is ideal if you're upgrading an existing 43, building a spare upper, or creating a red-dot-ready carry gun from scratch—you choose the barrel, recoil spring, sights, and internals to match your use and preferences.

Brownells engineered this slide for reliability and practical installation. The optic-ready cut eliminates the need to send a factory slide out for machining, saving time and cost. The windowed slide is popular among builders who want a lighter, more distinctive profile without sacrificing durability or function. Whether you're setting up a concealed carry upgrade, a dedicated range build, or a backup upper, this Glock 43 slide gives you the foundation to do it right.

Key Features

• Stripped slide ready for custom assembly—select your own barrel, recoil system, and internals
• Milled for Holosun 407K/507K-style red-dot optics; direct mounting without additional machine work
• Heat-treated stainless steel construction with black nitride finish for corrosion and wear resistance
• Windowed design reduces weight and exposes the barrel for a custom appearance
• Front and rear angled serrations for reliable press checks and malfunction drills
• Compatible with Glock 43 Gen 1-3 frames

Specifications

Frequently Asked Questions

What does "stripped slide" mean, and what do I need to assemble it?

A stripped slide is the bare metal receiver with no internal parts, firing pin, extractor, sights, or barrel. To complete your Glock 43, you'll need to source a barrel, recoil spring assembly, firing pin and channel, extractor, and front and rear sights separately. This approach lets you build the gun exactly as you want it for your specific use—whether that's a lightweight carry gun or a range shooter.

Will this slide work with my current Glock 43 frame?

Yes, this slide is compatible with Glock 43 Gen 1-3 frames. It's a direct replacement for a factory slide on those generations.

Does the Holosun 407K cut work with other red-dot optics?

This slide is machined specifically for Holosun 407K and 507K-style optics. Compatibility with other optics is not confirmed by the specifications provided; check your specific optic's footprint before purchasing.

What's the advantage of the windowed design?

The window reduces overall slide weight and creates a distinctive custom appearance by exposing the barrel. If you prefer a traditional, solid-top profile, Brownells also offers non-windowed versions of their premium slides.