XTech Tactical(R) MTX Magazine Extension is designed for factory Smith & Wesson M&P9 and M&P9 2.0 full-size 9mm magazines. The patented extension adds 5 rounds of capacity and includes a spring engineered specifically for the M&P9 platform to support reliable feeding and last-round slide hold-open. It features a black finish and is made in the USA.Key Features Designed for full-size Smith & Wesson M&P9 and M&P9 2.0 pistols Compatible with factory 9mm magazines Adds 5 rounds of magazine capacity Patented MTX extension design Includes an M&P9-specific magazine spring Designed to retain last-round slide hold-open functionality Black finish Made in the USAXTech Tactical(R) manufactures magazines and firearm accessories with an emphasis on durability reliability and functional design. The company develops components for a variety of popular firearm platforms and uses purpose-selected materials and manufacturing processes. XTech Tactical products are designed and manufactured with attention to consistent fit and dependable operation.