Promag115700014
Promag Sig Sp2340 40s&w Drum 50rd Bk$85.85
Availability: In Stock
Current Stock: Out of stock
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.
| Caliber | .40 S&W |
| Firearm Compatibility | Ruger P91 |
| Capacity | 50 rounds |
| Finish | Black |
| Body Material | DuPont Zytel-based polymer |
| Upper Tower | Blue steel |
| Follower | Injection-molded polymer |
| Spring | Heat-treated stainless steel |
| Country of Origin | USA |
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.
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.
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.
Yes, the Promag 50-round drum is manufactured in the USA.
SKU: 115809587 • Width: 7in • Height: 4.2in • Depth: 14.5in • Weight: 1.75oz
Availability: In Stock
Current Stock: Out of stock
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.
| Caliber | .40 S&W |
| Firearm Compatibility | Ruger P91 |
| Capacity | 50 rounds |
| Finish | Black |
| Body Material | DuPont Zytel-based polymer |
| Upper Tower | Blue steel |
| Follower | Injection-molded polymer |
| Spring | Heat-treated stainless steel |
| Country of Origin | USA |
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.
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.
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.
Yes, the Promag 50-round drum is manufactured in the USA.
SKU: 115809587 • Width: 7in • Height: 4.2in • Depth: 14.5in • Weight: 1.75oz