TK Custom Tuned S&W Model 640 Pro Series 9mm/38/357 Masterline Revolver
S&W 640 Pro Masterline – Custom 9mm/38/357 J Frame with TK Performance Action Job
The S&W 640 Pro Masterline is a tuned carry revolver built for those who want real-world performance in a concealable double-action platform. Based on the Performance Center Pro Series J Frame this revolver has been completely upgraded in-house and professionally rechambered to shoot 9mm with moon clips while retaining the ability to fire .38 Special and .357 Magnum without clips.
Designed for shooters who demand precision under pressure this revolver features a full Performance Action Job, chamfered cylinder, polished internals, and premium spring upgrades. The trigger breaks smooth and clean with a measured 8.75LB double-action pull. Every detail of this revolver is refined and hand-fit for carry-ready function.
Each 640 Pro Masterline is built start to finish by Master Gunsmith Eli Johnson. There are no factory shortcuts and no stock internals left untouched. This is elite-level revolver tuning for shooters who know the difference.
Each Masterline revolver comes with ten stainless steel moon clips and a TK Custom unloading tool. You’re fully equipped and ready to go from box to holster.
Key Features
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Availability: Ships in 14 Business Days!!!! -
PERFORMANCE ACTION JOB – Includes extended firing pin, reduced mainspring, rebound and firing pin springs, aluminum mainspring retainer, endshake correction, and crane alignment. All internal radiuses are hand-polished and the barrel is assessed for clock alignment. Trigger pull is a smooth 8.75LB double-action and cycles clean from start to finish.
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Gunsmith – Each revolver is personally hand tuned and tested by Master Gunsmith Eli Johnson
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9MM CONVERSION – Professionally rechambered for 9mm moon clips, also fires .38 Special and .357 Magnum without clips
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CONCEALED CARRY OPTIMIZED – Polished internals and tuned geometry deliver a smooth, reliable, double-action-only trigger
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ACCESSORIES INCLUDED – Comes with ten stainless steel moon clips and a TK Custom unloading tool
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SIGHT SYSTEM – Factory Night Sights
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FINISH – Brushed Stainless Steel
Why Shooters Choose TK Custom
TK Custom is trusted nationwide by concealed carriers, law enforcement professionals, and competitive revolver shooters. Our Performance Action Job has become the industry standard for smooth, reliable, hand-tuned Smith & Wesson revolvers. Built to run. Built to last. Built to perform when it counts.
Spec Ops Profile
- Gunsmith: Eli Johnson
- Performance Action Job Includes: Extended Firing Pin. Reduced Main Spring. Reduced Rebound Spring. Reduced Firing Pin Spring. Aluminum Main Spring Retainer. Crane Alignment. Endshake Correction. Chamfered Cylinder. Polishing of Internal Radiuses. Barrel Clock Assessment.
- Caliber: 9mm / .38 Special / .357 Magnum
- Capacity: 5 Rounds
- Frame Size: Small (J Frame)
- Action: Double Action Only
- Barrel Length: 2.13 inches
- Weight: 22.4 oz
- Finish: Brushed Stainless Steel
- Sights: Factory Night Sights
- Optic Ready: No
- Model: S&W 640 Pro Series
- Trigger Pull: 8.75LB Double Action
- Accessories Included: 10 Stainless Steel Moon Clips, TK Custom Unloading Tool
*Ensure compliance with your state firearm laws before purchase. Includes signature-confirmed insured shipping at a flat rate of fifty dollars.*
Built and tuned in the USA. Carry optimized. Masterline approved.
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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