Smith & Wesson M&P .40 S&W Trigger Bar Assembly & Spring Used – Part# MP4019

Smith & Wesson M&P .40 S&W Trigger Bar Assembly & Spring – Used

Part Number: MP4019  |  Condition: Used (Factory Original)  |  Caliber: .40 S&W

Restore your M&P .40 to factory-correct function with this genuine Smith & Wesson trigger bar assembly and spring. The trigger bar is a critical fire control component that transfers trigger pull to the sear, initiating the firing sequence. This listing includes both the trigger bar and the associated spring as an assembly.

• Part Number: MP4019
• Fits: Smith & Wesson M&P .40 S&W
• Caliber: .40 S&W
• Includes: Trigger bar assembly and spring
• Condition: Used – factory original S&W part
• Installation: Gunsmith fitting required; fire control components are safety-critical

Compatibility Note

This trigger bar assembly is specific to the M&P .40 S&W. Trigger bar assemblies are caliber-specific and are not interchangeable between 9mm, .40 S&W, and .45 ACP M&P variants. If you are unsure of compatibility, contact us with your model and serial number.

Factory Replacement Quality

Genuine Smith & Wesson factory parts are manufactured to the exact specifications and tolerances of the originals — same materials, same dimensions, same reliable function.

Professional gunsmith installation required. Fire control components are safety-critical and must be properly fitted and tested before use.