The XTech MTX Magazine Extension for the M&P Shield is a high-performance upgrade that enhances both capacity and grip. Designed for the 9mm and .40 S&W Shield and Shield 2.0 models, it adds 2 rounds to 9mm magazines and 1 round to .40 S&W magazines. The extension is built from durable injection-molded polymer and features a patented design with a consistent internal wall for reliable feeding. It includes a custom-engineered spring for 9mm applications that ensures dependable last-round slide hold open, while .40 S&W users retain the use of the factory spring. With fast installation and dependable functionality, this extension is a must-have for Shield owners.