Smith & Wesson M&P .40 S&W Trigger Bar Assembly Used – Part# MP4019D

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

Part Number: MP4019D  |  Condition: Used (Factory Original)  |  Caliber: .40 S&W

Restore your M&P .40 to factory-correct function with this genuine Smith & Wesson replacement trigger bar assembly. The trigger bar is a critical fire control component that transfers trigger pull to the sear, initiating the firing sequence.

• Part Number: MP4019D
• Fits: Smith & Wesson M&P .40 S&W (full-size)
• Caliber: .40 S&W
• 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 full-size M&P .40 S&W. It is not interchangeable with the M&P .40 Compact (MP4019A/MP4019A1), 9mm, or .45 ACP 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.