Smith & Wesson K Frame Model 18 Grooved Trigger Assembly
Part Number: K497
Condition: Used - Good
Frame: K Frame
Model: 18 Combat Masterpiece
Caliber: .22 LR
Trigger Width: .265 inches
Finish: Case Hardened
Style: Grooved (Serrated)
Includes: Trigger, hand, torsion spring, and trigger lever
Weight: 2 oz
Product Details
Genuine Smith & Wesson factory grooved trigger assembly for the K Frame Model 18 Combat Masterpiece revolver. This complete assembly includes the .265-inch wide grooved trigger, hand (pawl), torsion spring, and trigger lever. Case hardened finish provides exceptional wear resistance and durability. The grooved face ensures positive finger contact for consistent trigger control. Perfect for repairs, restoration, or upgrading your classic .22 target revolver.
About the Model 18
The Smith & Wesson Model 18 Combat Masterpiece is a legendary .22 LR target revolver built on the medium K Frame platform. Introduced in 1949 (originally as the K-22 Masterpiece), the Model 18 features adjustable sights, a 6-shot cylinder, and is available in 4-inch and 6-inch barrel lengths. The Model 18 is renowned for exceptional accuracy, smooth trigger action, and reliability. It's extremely popular for target shooting, small game hunting, training, and competitive shooting. The .22 LR chambering makes it economical to shoot while maintaining the feel and handling of centerfire K Frame revolvers.
Complete Trigger Assembly
This is a complete trigger assembly, not just the trigger shoe. It includes all the critical components that work together to rotate the cylinder and cock the hammer. The hand (also called the pawl) rotates the cylinder as you pull the trigger. The torsion spring provides tension for the hand. The trigger lever connects the trigger to the rebound slide. Having all these components together ensures proper fit and function.
Trigger Specifications
The .265-inch trigger width is the standard service trigger size for K Frame revolvers. The grooved face provides excellent tactile feedback and prevents finger slippage during double-action shooting. This trigger is wider than target triggers (.312" or .500") but narrower than combat triggers (.400"+), making it ideal for general use where a balance between speed and precision is required. Case hardening provides superior wear resistance compared to standard blued finishes.
Function & Compatibility
The trigger assembly is the heart of the revolver's action. When pulled, the trigger rotates the cylinder via the hand, cocks the hammer (in double-action), and releases the hammer to fire. The grooved surface provides positive contact for consistent trigger control, especially important in double-action shooting. Proper trigger pull technique is essential for accuracy with revolvers.
This trigger assembly is specifically designed for Smith & Wesson K Frame Model 18 revolvers chambered in .22 LR. It may also fit other K Frame models with similar specifications - contact us to verify compatibility for your specific revolver.
K Frame .22 Revolvers
The Model 18 is part of Smith & Wesson's K Frame .22 family, which includes the Model 17 (K-22 Masterpiece with 6-inch barrel) and Model 48 (K-22 Masterpiece MRF in .22 Magnum). These revolvers are highly regarded for training, competition, and recreational shooting. The K Frame size provides excellent handling and pointability while the .22 LR chambering offers low recoil and economical ammunition.
How to Identify Your S&W Model
To determine your Smith & Wesson revolver model number, swing out the cylinder and check behind the yoke on the frame for the model number stamped into the metal. You should see "18" or a dash variant like "18-1", "18-2", etc. Model numbers began in 1957-58. If no model number is present, your revolver may be a pre-model K-22. Contact us with your serial number for assistance in identifying the correct parts.
Installation & Specifications
- Professional gunsmith installation strongly recommended
- Requires disassembly of grip frame and internal action components
- Complete assembly includes trigger, hand, torsion spring, and trigger lever
- All components must be properly fitted to ensure correct engagement
- Improper installation can cause dangerous malfunctions
- Factory OEM parts manufactured to exact S&W specifications
- Used parts inspected for wear and functionality
- Compatible with K Frame Model 18 .22 LR revolvers
- May fit other K Frame models - verify compatibility
- Grooved face for positive finger contact
- .265" width - standard service size
- Case hardened finish for durability
Trigger Performance Notes
The trigger assembly directly affects shooting performance. A grooved trigger provides better tactile feedback than smooth triggers, helping shooters maintain consistent finger placement. The .265" width is narrow enough for precise single-action work but wide enough for comfortable double-action shooting. The Model 18 is famous for its exceptionally smooth trigger action, making it ideal for developing proper trigger control skills.
Condition Notes
This is a used OEM trigger assembly removed from a functioning Smith & Wesson Model 18 Combat Masterpiece revolver. Shows normal wear consistent with use. All engagement surfaces have been inspected for excessive wear or damage. Grooves are sharp and well-defined. Case hardened finish may show minor wear typical of used revolvers. All components included (trigger, hand, torsion spring, trigger lever). Guaranteed to function properly.
Contact Us
We specialize in Smith & Wesson pistol and revolver parts - used, new old stock, refurbished, and new. Our team has extensive knowledge of S&W firearms and can help you find the exact parts you need for your K Frame revolver.
Questions? Email sales@usagunsandgear.com or call 770-544-8075