Smith & Wesson M&P Trigger Bar Assembly. This trigger bar assembly is composed of a durable black polymer trigger with a stainless steel trigger bar / spring and is a factory original component from Smith & Wesson. The trigger bar is designed for both Full Sized and Compact versions of the M&P 9 / 40 models of pistols from Smith & Wesson chambered in 9mm & .40 S&W respectively. The trigger bar assembly provides standard factory trigger pull and engages the sear to fire the pistol. This assembly is perfect for use in an emergency replacement stash and can be great to have in the spare parts chest. This item is proudly made in the USA by Smith & Wesson.