Keep your slimline Glock running safely and reliably with the Firing Pin Safety & Spring – G43 (SKU: 100700155, Glock MPN: 33374). This OEM-spec firing pin safety plunger and spring is engineered for the compact Glock 43, 43X, and 48 9mm pistols, restoring smooth, positive operation of your striker safety system and helping prevent accidental discharge if the pistol is dropped or impacted.
Whether you're refreshing a high-round-count carry gun or completing a slide rebuild, this G43 firing pin safety with spring is a small, critical part that has a big impact on reliability and safety.
Genuine-Pattern Glock Firing Pin Safety Plunger & Spring
This assembly is built to factory Glock specifications, matching the dimensions and tolerances of the original firing pin safety and spring used in the G43 slimline series:
OEM-style design based on Glock part SP33374
Correct interface with the G43, G43X, and G48 firing pin and slide
Ensures your pistol’s drop-safety system functions as intended
Using a proper Glock-spec firing pin safety and spring helps maintain the legendary dependability that slimline Glock pistols are known for.
Compatible with Glock 43, 43X & 48 Slimline 9mm Pistols
The Firing Pin Safety & Spring – G43 100700155 is specifically designed for Glock’s slim, single-stack 9mm lineup:
Glock 43 – the original slim 9mm concealed carry Glock
Glock 43X – slimline 10-round 9mm with longer grip
Glock 48 – slimline compact with longer slide
It is not intended for double-stack models like the G19/G17 or for other generations and calibers; it’s purpose-built for the slim 9mm G43-pattern slide.
What the Firing Pin Safety Does – and Why It Matters
The firing pin safety plunger and spring are a key part of Glock’s Safe Action® system:
The plunger physically blocks the firing pin from moving forward unless the trigger is pulled fully to the rear.
The spring keeps the safety positively engaged until the trigger bar lifts and deactivates it during a proper trigger press.
Helps protect against unintentional discharge from impact or drops, as the firing pin cannot freely travel even if the pistol is jarred.
Keeping this component in top condition is essential to preserving the factory safety features your Glock was designed with.
Restore Smooth, Reliable Trigger and Safety Operation
Over time, the firing pin safety and its spring can:
Collect carbon, debris, and dried lubricant
Experience wear or minor peening from repeated cycling
Develop weak or inconsistent spring tension
Symptoms of a worn or dirty firing pin safety system can include:
Gritty or inconsistent trigger take-up
Sluggish striker movement and occasional light strikes
Uncertain or “mushy” feel as the trigger bar lifts the safety plunger
Replacing the assembly with a fresh G43 firing pin safety & spring 100700155 helps restore:
Smooth, predictable trigger pre-travel as the safety is deactivated
Consistent striker movement for reliable ignition
Confidence that your internal drop safety is functioning properly
High-Quality Steel Construction for Long Service Life
The safety plunger is made from durable steel designed to withstand thousands of cycles, while the spring is tuned for reliable, repeatable movement:
Hardened steel plunger resists wear in the slide bore
Precision-wound spring provides consistent upward tension to keep the safety engaged
Built to the same style of material specs used in Glock’s original parts
When combined with regular cleaning of the striker channel and safety bore, this assembly helps your slimline Glock run like new.
Ideal for Maintenance, Repairs & Spare Parts Kits
Because this part is both inexpensive and critical to safe function, it’s smart to keep at least one on hand:
Preventive maintenance for high-round-count Glock 43/43X/48 pistols
Repair or refresh of used or police trade-in slides
Essential component in a Glock armorer’s kit or serious shooter’s parts box
Swapping in a fresh firing pin safety & spring during a detail strip is a small step that can add up to big peace of mind.
Simple Drop-In Part for Experienced Users
The Firing Pin Safety & Spring – G43 is a drop-in component designed for the G43-series slide:
Fits into the factory safety bore in the slide
Interfaces with the trigger bar ramp and firing pin just like the original
No permanent modification required when used with OEM-spec parts
Because this is a crucial safety part, many manufacturers and retailers recommend installation by a qualified gunsmith or certified Glock armorer, especially if you are unfamiliar with striker-fired slide internals.
Key Specs – Firing Pin Safety & Spring G43 100700155
From Glock/OEM listings and major parts retailers:
Product: Firing Pin Safety & Spring – G43
SKU / Brownells #: 100700155
Glock MPN: 33374 (SP33374)
Fit / Compatibility:
Glock 43 (9mm)
Glock 43X (9mm)
Glock 48 (9mm)
Material: Steel safety plunger with matching safety spring
Configuration: OEM-style replacement firing pin safety plunger plus spring
Function: Blocks firing pin movement until trigger is pulled; part of Glock’s internal safety system
(Always double-check your model and part numbers before ordering to ensure correct fitment.)
Who Should Choose the G43 Firing Pin Safety & Spring 100700155?
This part is an excellent choice if you:
Carry a Glock 43, 43X, or 48 for personal defense and want to maintain OEM-level safety and reliability
Are rebuilding or upgrading a slimline slide and prefer factory-correct internal parts
Have a high-mileage pistol and want to refresh critical safety components
Maintain a fleet of Glock slimline pistols for training, duty, or rental and need proven, OEM-spec replacements
If you trust your slimline Glock with your safety, you should be able to trust the parts inside it. The Firing Pin Safety & Spring – G43 100700155 (Glock 33374) is a small but vital upgrade that keeps your pistol’s internal safety system working exactly as designed.
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