Promag Ruger P91 .40s&w Drum 50rd Bk

The Promag 50-round drum magazine for Ruger P91 .40 S&W pistols is a high-capacity option for shooters who want extended magazine capacity without swapping during range sessions or practice drills. Built on a reinforced polymer design, this drum magazine combines practical capacity with reliable feeding, making it a solid choice for P91 owners who shoot frequently or compete.

Capacity and reliability are the two reasons shooters reach for drum magazines. Fifty rounds in a single magazine means fewer reloads at the range or during training, and the Promag design for the P91 is engineered to feed the .40 S&W round consistently. The magazine body uses a durable DuPont Zytel-based polymer, proven in demanding shooting environments for wear resistance and longevity. The upper tower is blue steel—a detail that matters because it handles the mechanical stress of the feed lips and ensures they stay true over thousands of rounds.

Inside, you'll find the mechanics that separate a reliable high-capacity mag from a novelty: an injection-molded follower that guides rounds smoothly and a heat-treated stainless steel spring that maintains tension and feeding reliability cycle after cycle. Everything is made in the USA, which is worth knowing if you value domestic manufacturing.

Drum magazines do come with trade-offs—they're bulkier than standard mags and can take longer to load if you're hand-cycling rounds—so they're best suited to range days and training rather than compact carry. But if you own a P91 and want to minimize downtime between magazines, this is a straightforward, functional choice.

Key Features

• 50-round capacity for extended shooting without mag swaps
• DuPont Zytel-based polymer body for durability and impact resistance
• Blue steel upper magazine tower for reliable feed lips and mechanical durability
• Injection-molded follower for smooth, consistent round feeding
• Heat-treated stainless steel spring for long-term reliability and tension
• Made in the USA
• Designed specifically for Ruger P91 .40 S&W pistol

Specifications

Frequently Asked Questions

Will this 50-round magazine work in my Ruger P91?

Yes—the Promag drum is designed specifically for the Ruger P91 chambered in .40 S&W. It's not a universal mag; it's built for your platform.

What is the magazine made of?

The body is constructed from a DuPont Zytel-based polymer, which resists impact and wear. The upper magazine tower is blue steel to handle the stress of the feed lips, and the spring is heat-treated stainless steel for longevity.

Is this magazine suitable for everyday carry?

Drum magazines are bulkier and slower to load than standard magazines, making them better suited for range work and training rather than compact or defensive carry.

Is this a made-in-USA product?

Yes, the Promag 50-round drum is manufactured in the USA.