The Smith & Wesson M&P40 20-Round Magazine is a dedicated factory magazine designed for M&P full-size pistols chambered in 40 S&W. Built around a robust steel body with a high-visibility witness window, this magazine offers reliable feeding and extended capacity for shooters who prefer staying on the line longer between reloads.

This model features a 20-round capacity with clearly marked witness holes to help monitor remaining rounds at a glance. The extended basepad provides additional grip surface and helps ensure positive seating during reloads, making it well suited for range sessions, training, or competition use where extra capacity is beneficial. Backed by Smith & Wesson’s long-standing reputation for dependable firearms and accessories, this magazine is a practical upgrade for any M&P40 owner.

Key Features:

• Manufacturer: Smith & Wesson
• Model: M&P Full Size Magazine 40 S&W 20-Round
• Caliber: 40 S&W
• Capacity: 20
• Weight: 4 oz