Description
Building a Glock from a bare slide? This Lone Wolf completion kit gives you the parts to do it right the first time. Whether you're putting together a G22, G23, G24, G27, or G35, this package has everything you need except a barrel, recoil spring, and sights.
The Main Draw of the .40 Completion Kit
What makes this kit stand out is the marine spring cups. Glock doesn't sell these to civilians—only to law enforcement and the military. These cups reduce material in the striker channel to allow better water drainage and help the gun function even if it's gotten soaked. If you wade fish, hunt in wet conditions, or just want every advantage for reliability in demanding environments, these give you capability most off-the-shelf Glocks don't have. Even if water exposure isn't part of your world, these cups come in the kit, so you get them as part of the package.
What You Get in the Kit
You'll find the complete striker assembly setup here: firing pin, firing pin safety, mid-weight striker spring, firing pin safety spring, and yes, those marine spring cups. The kit also includes a channel liner, spacer sleeve, spring-loaded bearing, extractor with LCI (load chamber indicator), extractor depressor plunger, and the slide cover plate. Everything is made in the USA and built to solid tolerances using CAD design and CNC manufacturing.
Real-World Notes
Built correctly, the parts integrate cleanly without fitting issues. The quality is proven across the competitive shooting and custom build communities. The plastic components use proprietary colors so you can visually distinguish which gun has which parts if you're building multiples. You'll need to source your own barrel, recoil spring assembly, and sights to finish the slide, but those are items most builders source separately anyway based on their specific needs.
Key Specifications
- Manufacturer: Lone Wolf Distributors
- Manufacturer Part Number: LWD-SLIDEKIT-40
- UPC: 639737069075
- Caliber: .40 S&W
- Compatible Glock Models: M22, M23, M24, M27, M35
- Compatible Generations: Gen 1, Gen 2, Gen 3, Gen 4
- Country of Origin: USA
- What's Not Included: Barrel, Recoil Spring Assembly, Sights
What’s Included
- Firing Pin Safety
- Firing Pin (mid-weight)
- Firing Pin Safety Spring
- Firing Pin Spring (mid-weight)
- Firing Pin Spring Cup (marine)
- Striker
- LCI Extractor
- Extractor Depressor Plunger
- Extractor Depressor Plunger Spring
- Channel Liner
- Spacer Sleeve
- Spring Loaded Bearing
- Slide Cover Plate
Frequently Asked Questions
What exactly makes the marine spring cups special?
Marine cups have less material in the striker channel than standard cups. This allows water to drain better and prevents water pressure from slowing down the firing pin as much, which is why they're standard on Glock law enforcement models. Glock restricts civilian sales of their marine cups, so having them included in this kit is a real advantage. Most builders who want them end up sourcing them separately at higher cost.
Can I use this kit on any Glock .40?
Yes, it fits Glock models 22, 23, 24, 27, and 35 in generations 1 through 4. The kit won't work with Gen 5 slides, and it's not compatible with G43/43X/48 models. If you're building on a bare .40 slide from any of the compatible models, this kit has the internals you need.
Is the kit complete for building a functioning slide?
It covers all the internal parts—firing pin assembly, springs, extractor, safeties, and controls. You'll still need to source a barrel, recoil spring assembly, and sights separately. Once you have those three items, the kit gives you everything else to finish the upper.
How does this compare to buying parts individually?
Building from this kit gets you all the pieces in one bag, which saves time hunting down individual parts. Since components like marine spring cups and some internal parts go on backorder frequently, many builders prefer having them all together rather than trying to source them separately as availability fluctuates.




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