Smith & Wesson Centerfire Revolver Extended Firing Pin Kit – Competition & Duty Grade | TK Custom
SKU SWEFP
TK Custom Extended Firing Pin Kit – Smith & Wesson Centerfire Revolvers
If you're looking to improve the reliability of your Smith & Wesson centerfire revolver and prevent dangerous, unexpected light strikes, TK Custom has the solution trusted by competition and duty shooters alike.
This extended firing pin and spring combo kit enhances primer engagement and supports smoother trigger pulls—especially in tuned centerfire revolvers running lighter spring setups. Whether you shoot USPSA, IDPA, or carry for defense, consistent ignition matters.
Key Features
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Availability: Ships within 4 business days
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REDUCES LIGHT STRIKES – Better ignition with duty, match, and bulk ammo—even with reduced-power spring kits.
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COMPETITION & CARRY READY – Trusted by national championship-level shooters and tuned for defensive reliability.
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DROP-IN INSTALL – Fits in minutes with basic tools. No gunsmithing needed.
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FITS MODERN CENTERFIRE REVOLVERS – J, K, L, and N Frame Smith & Wessons. Not for rimfire or pre-lock models.
Why Shooters Choose TK Custom
We build parts that work harder because we’re shooters who demand more. This firing pin kit is used by revolver competitors, instructors, and performance-minded shooters across the U.S. If your centerfire revolver is tuned to win—or trusted to protect—this kit makes sure it fires every time.
Spec Ops Profile
- Part Name: Extended Firing Pin Kit
- Platform: Smith & Wesson J/K/L/N Frame Centerfire Revolvers
- Includes: 1 Extended Firing Pin + 1 Reduced Power Firing Pin Spring
- Install Type: Drop-In
- Not Compatible: Rimfire models or pre-lock Smith & Wesson frames
*Quality you can see. Excellence you can feel.*
Free Shipping on orders over $250.00 in the USA only!
Smaller orders less than $250.00 are $9.95 for shipping.
No Free Return Shipping with Labor
No International Shipping, except to Canada.
$35.00
Canada - Priority Mail / NO Tracking Out side of USA
FREQUENTLY ASKED QUESTIONS
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Federal or Remington & others makes works the best with the .025 thick Full Moonclips, which fit all the .38/357 standard moonclip. They allow the cartridges to have some movement or wiggle so that they will fall right into the chambers once properly aligned. Winchester brass does not work at all as the groove width is too tight/small.
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Use this text block to discuss some commonly asked questions like shipping and returns, sizing, warranties, or product and company details.
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There is no SAAMI specifications for the extractor groove and each manufacturer makes them as they want. The following list gives you a great example. This is why the diameter size of the brass is critical to proper loading, unloading and fitment. Cartridge diameter too big and moonclip too small causes the moonclip to bend. The cartridge should rotate within their respective place and wobble slightly when all cartridges are loaded.
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If you are unsure about how to use moon clips for your revolver, or wondering which moon clip to use, call us. See the Contact menu tab.
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