The Slide Stop Lever & Spring – Fits .45 Gen4 Glock Pistols (Part #5423) is a genuine-style replacement slide stop assembly designed to restore reliable lock-back and slide manipulation on your .45 ACP Gen4 Glock. Whether you’re maintaining a duty pistol, refreshing a high-round-count carry gun, or completing a build, this slide stop lever and spring combo is an essential small part that keeps your firearm running the way it should.
If your slide is no longer locking open on an empty magazine or your lever feels mushy and inconsistent, a fresh .45 Gen4 slide stop lever & spring 5423 is the simple fix.
Built to Fit .45 ACP Gen4 Glock Pistols
This slide stop lever and spring is engineered specifically for Gen 4 .45-caliber Glock frames, including popular models such as:
Glock 21 Gen4 (full-size .45 ACP)
Glock 41 Gen4 (long-slide .45 ACP)
Other OEM Glock .45 Gen4 variants that share the same slide stop spec
Always verify fitment with your pistol’s manual or parts diagram, but this part number 5423 is designed around the Gen4 .45 ACP Glock platform, not 9mm, .40, or earlier/later generations.
Restore Positive Slide Lock & Release
Over time, slide stop levers and their springs can wear, bend, or weaken due to:
Signs you might need a new slide stop lever & spring include:
Slide fails to lock open consistently on an empty magazine
Lever feels “soft” or doesn’t return positively to its resting position
Difficulty manually locking the slide to the rear
Replacing your worn part with a Gen4 .45 slide stop lever & spring 5423 helps:
Restore reliable lock-back on empty
Provide a crisper, more positive lever feel
Support smoother reloads and administrative handling of the pistol
For defensive, duty, or training use, this is a critical function you can’t afford to ignore.
Correct Gen4 Design with Extended Thumb Shelf
Gen4 Glock slide stop levers are designed with updated ergonomics compared to some earlier parts. A proper .45 Gen4 slide stop lever offers:
A low-profile design that still provides a usable shelf for your thumb
Enough surface area for consistent, controlled slide release during reloads
Compatibility with Gen4 frame dimensions and internal geometry
This part is intended to drop into factory-spec Gen4 .45 frames and work seamlessly with OEM-style internals.
Quality Construction for Duty-Grade Reliability
A slide stop lever is a small part, but it has an important job:
Withstands repeated impact from the slide as it locks open
Interfaces with the magazine follower under recoil
Acts as one of the primary controls during reloads and clearing procedures
The Slide Stop Lever & Spring Fits .45 Gen4 (5423) is constructed for:
Durable metal construction that resists deformation
A properly tensioned spring that keeps the lever in its correct resting position
Reliable performance in both casual range use and high-stress applications
For peace of mind, many shooters prefer OEM-spec parts in critical control components like this.
Ideal for Maintenance, Repairs, and Armorer Kits
Slide stop levers and springs are affordable, high-impact maintenance items. This 5423 assembly is perfect for:
Preventive maintenance on carry and duty pistols
Repairing older Gen4 .45 Glocks that show inconsistent slide lock behavior
Armorer’s kits for agencies, instructors, or serious Glock enthusiasts
Spare parts for training fleets and range rental guns
Having at least one extra .45 Gen4 slide stop lever & spring on hand is smart insurance against unexpected failures.
Easy Drop-In Installation
If you’re comfortable field stripping your Glock, a slide stop lever & spring swap is straightforward:
Unload and field strip the pistol (verify clear).
Remove the locking block and trigger pin as per Glock armorer’s procedure.
Take out the old slide stop lever and spring.
Drop in the new 5423 slide stop lever & spring in the correct orientation.
Reinstall pins, function-check, and perform a live-fire verification at the range.
No permanent modification is required when replacing a worn slide stop lever with a matching Gen4 .45 part.
Perfect for Duty, Defense, and Competition .45 Glocks
If you rely on a Glock 21 Gen4, 41 Gen4, or similar .45 Gen4 platform, slide control is critical:
Duty & defensive shooters need consistent slide lock to confirm empty status under stress.
Competitive shooters rely on predictable lock-back and slick slide releases for fast reloads.
High-volume trainers push their guns hard and benefit from fresh, robust control parts.
Upgrading or replacing your lever and spring with a Gen4 .45-specific part number 5423 keeps your pistol running smooth.
Key Features – Slide Stop Lever & Spring Fits .45 Gen4 5423
Part Number: 5423
Type: Slide stop lever & spring assembly
Compatibility:
Function:
Design:
Construction: Metal lever with properly tuned spring
Installation: Drop-in replacement; Glock armorer disassembly procedure recommended
(Always confirm fitment with your specific Glock model and follow all firearm safety rules during installation and testing.)
Why Choose the Slide Stop Lever & Spring Fits .45 Gen4 (5423)?
You should consider this .45 Gen4 slide stop lever & spring 5423 if you:
Own a Gen4 .45 ACP Glock that’s starting to show slide lock issues
Want to perform routine reliability maintenance on a carry or duty gun
Prefer OEM-style, correctly-spec’d parts over generic alternatives
Maintain multiple Glock pistols and need a reliable replacement part for your armorer kit
This small component plays a big role in how your pistol handles, reloads, and indicates empty. If you’re serious about reliability, the Slide Stop Lever & Spring Fits .45 Gen4 5423 is a wise, low-cost upgrade or replacement.
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