Genuine Smith & Wesson Factory OEM Part
This authentic Smith & Wesson upper trigger assembly (part #399500000) is a factory-original component engineered to exact OEM specifications. The upper trigger is a critical component of your pistol's trigger mechanism, working in conjunction with the lower trigger to ensure reliable function and safe operation across M&P and SD series pistols.
Key Features
- Factory OEM Smith & Wesson part - not aftermarket
- Part number: 399500000
- Precision-manufactured to S&W specifications
- Direct replacement for worn or damaged upper trigger assemblies
- Essential component for proper trigger function
- New condition
Compatibility
This upper trigger assembly fits a wide range of Smith & Wesson pistol models:
M&P Series: M&P9, M&P40, and M&P45 pistols in both full size and compact configurations (1.0 generation)
SD Series: SD9 VE and SD40 VE models
Installation
Professional installation by a qualified gunsmith is recommended. Proper fitting and function testing are essential for safe operation. The upper trigger works in conjunction with the lower trigger and other trigger components to ensure smooth, reliable trigger pull.
Why Choose Genuine S&W Parts? Factory OEM components guarantee proper fit, function, and reliability. Aftermarket parts may compromise safety and performance. When maintaining your Smith & Wesson pistol, insist on authentic factory parts.