ProMag 50-Round Drum Magazine — Smith & Wesson 5900, 9mm

The ProMag 50-round drum magazine is a high-capacity feeding device intended for use with compatible Smith & Wesson 910/915/459/5900 series 9mm handguns. It pairs a DuPont Zytel-based polymer drum housing with a full-length steel internal insert to combine modern polymer components and traditional stamped/welded steel magazine architecture. The unit features an injection-molded follower and a spring formed from heat-treated stainless steel. Made in the USA and backed by a lifetime guarantee against manufacturing defects.

Key Specifications

• The caliber is 9mm.
• The capacity is 50 rounds.
• Compatible with Smith & Wesson 910/915/459/5900 series handguns.
• The drum housing is constructed of a DuPont Zytel-based polymer.
• The magazine upper tower contains a full-length steel internal insert that is stamped and welded.
• The follower is injection-molded.
• The magazine spring is formed from heat-treated stainless steel.
• Finish/color is black.
• Manufactured in the USA.
• Backed by a lifetime guarantee against manufacturing defects.

Designed for shooters who require extended capacity for range sessions, competitions, or training, this ProMag drum magazine offers a practical, serviceable solution that emphasizes durability and consistent feeding. Its combination of steel components and mil-spec polymer construction provides a balance of strength and weight, making it suitable for regular use where increased capacity is needed.