$84.86
Availability: In Stock
When you need serious magazine capacity for your Glock 21 or 30, the ProMag 40-round drum magazine in .45 ACP delivers the rounds without the bulk of multiple standard mags. This polymer-constructed drum sits flush on your .45 and lets you extend your range time or training sessions between reloads. Built right here in the USA, ProMag backs every magazine with a lifetime guarantee against manufacturer defects—that's the kind of confidence you want in a high-capacity reload solution.
The heart of any reliable magazine is its spring, and ProMag doesn't cut corners there. Each drum uses a precision-wound spring made from heat-treated chrome silicon wire, the same material choice you'll find in premium ammunition and precision tooling. Every magazine goes through multiple assembly checkpoints before it leaves the factory, so you're not gambling on QC.
This isn't a mag for your duty pistol or carry gun—it's built for the shooter who wants more trigger time between magazine changes at the range, in a competition setting, or during training drills. The rugged polymer body handles the weight of 40 rounds of .45 ACP without flex, and the straightforward design means no fussy loading tricks—rounds feed as they should.
| Brand | ProMag |
| Caliber | .45 ACP |
| Capacity | 40 rounds |
| Firearm Compatibility | Glock 21, Glock 30 |
| Material | Polymer (body); heat-treated chrome silicon wire (spring) |
| Color | Black |
| Manufactured | USA |
| Warranty | Lifetime against manufacturer defects |
Yes. ProMag designed this drum specifically for Glock 21 and 30 platforms, both chambered in .45 ACP. Fit and function are matched to those frames.
The primary difference is capacity. Factory Glock 21 magazines typically hold 13 rounds; this ProMag holds 40. The drum's larger footprint accommodates the spiral feed design necessary for that capacity. The spring uses heat-treated chrome silicon wire and is precision-wound to handle repeated loading cycles.
Yes. ProMag manufactures and assembles this magazine in the United States. Each unit passes multiple quality checks during assembly.
ProMag backs this magazine with a lifetime warranty against manufacturer defects in materials and workmanship.
SKU: 115671536 • Width: 6.7in • Height: 3.6in • Depth: 16.5in • Weight: 1.94oz
Availability: In Stock
When you need serious magazine capacity for your Glock 21 or 30, the ProMag 40-round drum magazine in .45 ACP delivers the rounds without the bulk of multiple standard mags. This polymer-constructed drum sits flush on your .45 and lets you extend your range time or training sessions between reloads. Built right here in the USA, ProMag backs every magazine with a lifetime guarantee against manufacturer defects—that's the kind of confidence you want in a high-capacity reload solution.
The heart of any reliable magazine is its spring, and ProMag doesn't cut corners there. Each drum uses a precision-wound spring made from heat-treated chrome silicon wire, the same material choice you'll find in premium ammunition and precision tooling. Every magazine goes through multiple assembly checkpoints before it leaves the factory, so you're not gambling on QC.
This isn't a mag for your duty pistol or carry gun—it's built for the shooter who wants more trigger time between magazine changes at the range, in a competition setting, or during training drills. The rugged polymer body handles the weight of 40 rounds of .45 ACP without flex, and the straightforward design means no fussy loading tricks—rounds feed as they should.
| Brand | ProMag |
| Caliber | .45 ACP |
| Capacity | 40 rounds |
| Firearm Compatibility | Glock 21, Glock 30 |
| Material | Polymer (body); heat-treated chrome silicon wire (spring) |
| Color | Black |
| Manufactured | USA |
| Warranty | Lifetime against manufacturer defects |
Yes. ProMag designed this drum specifically for Glock 21 and 30 platforms, both chambered in .45 ACP. Fit and function are matched to those frames.
The primary difference is capacity. Factory Glock 21 magazines typically hold 13 rounds; this ProMag holds 40. The drum's larger footprint accommodates the spiral feed design necessary for that capacity. The spring uses heat-treated chrome silicon wire and is precision-wound to handle repeated loading cycles.
Yes. ProMag manufactures and assembles this magazine in the United States. Each unit passes multiple quality checks during assembly.
ProMag backs this magazine with a lifetime warranty against manufacturer defects in materials and workmanship.
SKU: 115671536 • Width: 6.7in • Height: 3.6in • Depth: 16.5in • Weight: 1.94oz