Smith & Wesson M&P40 20RD Magazine Features The Smith & Wesson M&P40 20-round magazine is engineered for reliable function in full-size M&P .40 S&W pistols. This extended capacity pistol magazine offers smooth feeding and dependable lockup under repeated use. Constructed from steel for strength and long-term durability the blued finish enhances corrosion resistance. Weighing approximately 4 oz it maintains manageable balance while increasing onboard capacity. Smith & Wesson M&P40 20RD Magazine Specifications Manufacturer: Smith & Wesson Model: M&P Full Size Magazine Caliber: .40 S&W Capacity: 20 Rounds Material: Steel Finish: Blued Weight: 4 oz