TTI Base Pad for M&P Full Size For M&P 9/40 5/ 6 Features: The single piece CNC machined aluminum design adds a few ounces to help empty mags drop freely for faster magazine changes and won't break on impact with the ground. This model features a black hardcoat anodized finish that will last. Designed to work with the OEM follower spring for maximum reliability this magazine extension is a great upgrade for your competition gun. TTI Base Pad for M&P Full Size For M&P 9/40 5/ 6 Specifications: Compatible with M&P full size 9/40 Compatible with 2.0 magazines 4 9mm 2 .40 caliber Designed for use with OEM follower spring Patented push pin design for easy installation No specialty tools required Machined from billet aluminum Black hardcoat anodized Fits USPSA 140mm gauge Production division legal Made in the U.S.A. Length: 1.5"