ProMag SD40 Drum Magazine .40 S&W 50-Round

The ProMag Drum Magazine provides a high-capacity magazine solution for Smith & Wesson SD40 pistols chambered in .40 S&W. It offers a 50-round drum configuration built with a Zytel-based polymer body and a hybrid steel upper magazine tower. Components including an injection-molded follower and a heat-treated stainless steel spring are used to support consistent feeding; the magazine is made in the USA.

Key Specifications

• Designed for the .40 S&W cartridge and fits Smith & Wesson SD40 pistols.
• The capacity is 50 rounds in a drum configuration.
• The magazine body is constructed from a DuPont Zytel-based polymer.
• The upper magazine tower uses a hybrid steel design.
• The follower is injection-molded for reliable movement.
• The magazine spring is formed from heat-treated stainless steel.
• The finish/color is black.
• Manufactured and assembled in the USA.
• Includes a lifetime guarantee against manufacturer’s defects as provided by ProMag.
• The listed weight is approximately 1.75 (shipping weight listed as 1.75).

Built for range sessions, extended drills, and training where higher capacity is required, this ProMag drum magazine pairs a durable polymer body with steel reinforcement in the feed tower and a precision-wound spring to support consistent operation. Its straightforward design and American manufacturing make it a practical option for users who need added capacity and reliable feeding in a Smith & Wesson SD40-compatible magazine.