Description: Smith & Wesson M&P, and SDVE Trigger Return Spring. This trigger return spring is crafted from strong steel and is a factory original part from Smith & Wesson. The return spring is designed for all Full Sized, Compact, & Shield versions of the M&P 9 / 40 / 45 models of pistols from Smith & Wesson chambered in 9mm, .40 S&W, & .45 ACP respectively. The return spring provides tension to the trigger bar to give it the proper travel resistance. This spring 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.