This is a direct-replacement Unlocking Block Pin Set for the FN 509 and FNS-C platforms, designed to solve the common problem of factory solid pins being difficult to remove during routine maintenance. The set replaces the solid front unlocking block pin with three coil pins that install and remove with less resistance, reducing the risk of marring the frame or damaging the pin during disassembly. Each pin has been test-fired to withstand thousands of rounds without bending or walking out.
Compatibility
- FN 509 (all variants: Compact, Tactical, LS Edge, MRD)
- FN FNS-C (Compact)
- FN FNS-9 / FNS-40 (Long Slide — verify fitment)
- Does NOT fit FN FNX or FNP series
Key Features
- Three (3) coil pins per package — replace after each removal
- 100% USA-sourced materials and manufacturing
- Direct drop-in fit; no modification to the slide or frame
- Install left-to-right, remove right-to-left (same direction as factory pin)
- Each pin is single-use — replace after removal
Install Difficulty: 1/5
Tools needed: Punch (3/32” or 2.5mm), nylon or brass hammer, bench block. No fitting required.
FAQ
Why three pins in one package?
Each coil pin is designed for single use. Once removed, it should be discarded and replaced. Three pins give you three maintenance cycles before reordering.
Will these pins walk out under recoil?
No. These pins have been test-fired over thousands of rounds on the FN 509 and FNS-C platforms without walking or bending under normal use.
Can I reuse the pin if I only removed it once?
No. Coil pins lose spring tension after removal. Replace with a new pin each time to maintain proper retention.
Shipping & Warranty: Ships same business day if ordered before 2 PM ET. This product carries a limited lifetime warranty against manufacturing defects. See our Warranty & Returns page for full terms.
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