XTech Tactical MTX M&P Shield 9mm 2 Round/.40 1 Round Magazine Extension Black 1 XTT125-BLK SHIELD MTX. 40 S&W. Designed for EDC duty or tactical use this patented extension ensures flawless feeding and installs in seconds. Compatible with factory magazines it features a consistent internal wall and includes a custom-engineered spring for 9mm models ensuring reliability and last-round slide hold open. The ergonomic design provides improved grip while maintaining a compact profile. California compliant. Specifications for XTech Tactical MTX M&P Shield 9mm 2 Round/.40 1 Round Magazine Extension: Manufacturer: XTech Tactical Color: Black Magazine Capacity: 1 Round Caliber: 9mm Luger .40 S&W Gun Make: Smith & Wesson Gun Model: Smith & Wesson M&P Shield Features of XTech Tactical MTX M&P Shield 9mm 2 Round/.40 1 Round Magazine Extension Adds +2 rounds for M&P Shield 9mm +1 round for .40 Patented design for smooth feeding Custom-engineered spring (9mm) included Compatible with M&P Shield factory magazines Durable drop-tested construction California Compliant Package Contents: XTech Tactical MTX M&P Shield 9mm 2 Round/.40 1 Round Magazine Extension What firearm models does the manufacturer say XTech Tactical MTX M&P Shield 9mm 2 Round/.40 1 Round Magazine Extension is compatible with? The manufacturer says that XTech Tactical MTX M&P Shield 9mm 2 Round/.40 1 Round Magazine Extension is compatible with Smith & Wesson M&P ShieldXTech Tactical XTT125-BLK SHIELD MTX: MTX M&P Shield 9mm 2 Round/.40 1 Round Magazine Extension Black