Smith & Wesson M&P Base Pad and Spring Kit
For High Capacity magazines only. Will not work for ten round magazines. Not For Sale In California Models: M&P 9mm & .40 S&W Extended Base Pad, add's 5 rounds in 9mm and 4 rounds in .40 Overall length with new base is 140mm
Kit includes extended Base Pad, locking insert and +10% power spring.