XTech Tactical MTX for M&P Full Size +5 Extender Kit Black 5 XTT112-BLK MP9 MTX. 0 factory magazines. This patented design integrates seamlessly into the magazine eliminating feeding issues and ensuring unmatched reliability. The extension comes with a custom-engineered spring and installs in seconds without tools. Specifications for XTech Tactical MTX M&P9 5 Magazine Extender w/Spring: Manufacturer: XTech Tactical Color: Black Gun Model: Smith & Wesson M&P Full Size Features of XTech Tactical MTX M&P9 5 Magazine Extender w/Spring Adds +5-round capacity for M&P Full-Size 9mm Custom-engineered extended spring included Patented tool-free installation Rugged and reliable for tactical use Package Contents: XTech Tactical MTX M&P9 5 Magazine Extender w/Spring What firearm models does the manufacturer say XTech Tactical MTX M&P9 5 Magazine Extender w/Spring is compatible with? The manufacturer suggests that XTech Tactical MTX M&P9 5 Magazine Extender w/Spring is compatible with Smith & Wesson M&P Full SizeXTech Tactical XTT112-BLK MP9 MTX: MTX for M&P Full Size +5 Extender Kit Black