The Spring Loaded Bearing LCI for Glock® – Part #3439 is a genuine Glock OEM component designed specifically for pistols using the new-style Loaded Chamber Indicator (LCI) extractor system in .40 S&W, .357 SIG, and .45 GAP. Compact but critical, this spring loaded bearing (SLB) helps control extractor tension and ensures your LCI extractor functions correctly, supporting reliable extraction, ejection, and a clear visual/tactile chamber indication.
Whether you’re replacing worn parts in a hard-use duty gun, finishing a slide rebuild, or stocking a serious Glock spare parts kit, the Spring Loaded Bearing LCI 3439 keeps your pistol running with factory reliability and consistency.
Genuine Glock OEM Spring Loaded Bearing – Built for LCI Extractors
This is Glock Part No. 3439 (often sold under SKU SP03439), the new-style spring loaded bearing engineered to work only with LCI extractors, not the older non-LCI designs.
Key OEM advantages:
Designed by Glock for use with new-style LCI extractors #1899 (.40/.357) and #1902 (.45 GAP)
Shorter profile than the original, old-style SLB and cannot be used with old-style extractors
Manufactured at Glock’s Austrian facility to the same standards as factory-installed parts
Maintains Glock’s reputation for factory reliability, quality construction, and consistent performance
If you’ve upgraded to an LCI extractor or are replacing an LCI extractor in your slide, this is the correct matching bearing to use.
Caliber & Model Compatibility – .40 S&W, .357 SIG & .45 GAP
The Spring Loaded Bearing LCI 3439 is used with Glock pistols chambered in .40 S&W, .357 SIG, and .45 GAP that are equipped with the new-style LCI extractor.
Common compatible models include:
.40 S&W: Glock 22, 23, 24, 27, 35
.357 SIG: Glock 31, 32, 33
.45 GAP: Glock 37, 38, 39
These are standard-frame Glock pistols using the updated extractor system found on current-issue Finger Groove & Rail (FGR) frames.
Important: The 3439 SLB must be paired with the correct LCI extractor (#1899 or #1902). It is not compatible with old-style extractors and should not be used in that configuration.
Always confirm your pistol’s caliber, extractor style, and part numbers before ordering or installing.
What the Spring Loaded Bearing LCI Actually Does
Inside the slide, this spring loaded bearing works in conjunction with the extractor and extractor depressor plunger spring to:
Maintain proper tension on the LCI extractor
Support reliable case extraction and ejection
Allow the extractor to function as a Loaded Chamber Indicator, giving a visual and tactile indication when a round is chambered
Because it sits deep in the slide assembly, this small polymer part is easy to overlook—but when it’s worn, mismatched, or missing, you may see erratic ejection or LCI behavior. Replacing it with the correct OEM 3439 bearing helps ensure your slide operates the way Glock designed it.
New-Style SLB for LCI Systems – Shorter, Purpose-Built Design
Unlike the original spring loaded bearings used with older, non-LCI extractors, the 3439 LCI bearing is specifically shortened and reshaped for the LCI system:
Shorter overall length to correctly tension the LCI extractor
Tailored geometry for smooth, consistent extractor movement
Explicitly marked for use with LCI extractor assemblies only
If you’ve upgraded to an LCI extractor (for example, to get a loaded chamber indication in your .40 or .357), Glock specifies that the spring loaded bearing must be upgraded at the same time—that’s where part #3439 comes in.
Tough, Lightweight White Polymer Construction
The factory Spring Loaded Bearing LCI 3439 is made from durable white polymer, chosen for its low friction and long service life inside the slide.
Benefits of the polymer design:
Resists corrosion and cleaning chemicals
Lightweight, with no impact on slide mass or timing
Provides a smooth bearing surface for the extractor assembly
Easy to visually identify when disassembled, thanks to its white color
It’s a small part that’s built to last—but also easy and inexpensive to replace when you’re doing preventive maintenance.
Perfect for Maintenance, Repairs, and Spare Parts Kits
Because of its size and location, the spring loaded bearing is one of those parts that can be:
Having a Spring Loaded Bearing LCI 3439 on hand is smart for:
Routine slide overhauls and extractor replacements
Gunsmiths and armorers who service multiple Glock pistols
Serious shooters building a dedicated Glock spare parts kit
Swapping from old-style to new-style LCI extractor systems correctly
Many retailers explicitly recommend keeping spare LCI spring loaded bearings because they are easy to misplace but essential for proper extractor function.
OEM Reliability – Why Factory Parts Matter
Factory Glock parts like the 3439 Spring Loaded Bearing are produced under strict quality control, including:
In-house metallurgy and material testing
Tight dimensional tolerances for drop-in compatibility
Validation for service life, toughness, and performance under extreme conditions
That’s why Glock OEM parts are trusted by:
When you choose the Spring Loaded Bearing LCI for Glock® 3439, you’re choosing the same part Glock installs in their production pistols—no guesswork, no compromises.
Key Product Details – Spring Loaded Bearing LCI for Glock® 3439
Product Name: Spring Loaded Bearing LCI for Glock®
Glock Part Number: 3439
Alternate SKU: SP03439 (varies by retailer)
Type: Spring Loaded Bearing (SLB) for Loaded Chamber Indicator extractors
Calibers: .40 S&W, .357 SIG, .45 GAP
Compatible Extractors:
Compatible Models (examples): Glock 22, 23, 24, 27, 31, 32, 33, 35, 37, 38, 39 (LCI configuration)
Frame Type: Finger Groove & Rail (FGR) frames with new-style LCI extractors
Material: White polymer bearing
Position in Schematic: Part number 7 on Glock slide parts diagram (for applicable models)
Installation Note: Glock recommends that OEM parts be installed by a Glock-certified armorer or qualified gunsmith, and that all firearms be thoroughly inspected and function-tested after any parts replacement.
Why Buy the Spring Loaded Bearing LCI for Glock® 3439?
Choosing the SPRING LOADED BEARING LCI FOR GLOCK® 3439 gives you:
The correct OEM bearing for .40, .357, and .45 GAP Glock pistols with LCI extractors
A new-style, shorter SLB specifically designed for the LCI system
Factory reliability and performance backed by Glock’s stringent quality standards
A simple, inexpensive way to restore or maintain proper extractor tension and LCI function
An essential addition to any Glock spare parts kit, especially for duty and defensive pistols
For Glock owners and armorers who won’t compromise on reliability or safety, the Spring Loaded Bearing LCI 3439 is the right part to keep your slide assembly running exactly as Glock engineered it.
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