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The ProMag RUGA37 is a straightforward replacement or spare magazine built to work seamlessly with your Ruger SR40. It holds 15 rounds of .40 S&W ammunition, matching the standard capacity of factory SR40 magazines.
Construction is solid: the magazine body is made from heat-treated carbon steel with a blued oxide finish that holds up well to regular use. Inside, you've got an injection-molded polymer follower that glides smoothly on a chrome silicon wire spring. That spring is precision-wound to maintain consistent tension, so the magazine feeds reliably whether you're at the range or working through drills.
ProMag engineered this mag using traditional stamping and welding methods combined with modern injection molding, which keeps costs down without cutting corners on durability. The detachable design means you can swap it out quickly, and the removable floor plate makes it simple to disassemble for cleaning. Since the SR40 is no longer in production, having multiple reliable mags is smart thinking if you still run one of these pistols. Every ProMag magazine comes backed by a lifetime warranty against manufacturer defects.
Yes. The SR40 (full-size) and SR40c (compact) share the same magazine well, so the RUGA37 works in both. The 15-round magazine will protrude slightly below the grip on the compact version, but it feeds and functions without issue.
The RUGA37 matches the factory 15-round capacity and uses similar materials. The main difference is cost—ProMag's manufacturing approach (stamping and welding heat-treated steel with injection-molded components) keeps prices lower than OEM magazines while maintaining reliability. The lifetime warranty covers any defects.
No special break-in needed. Load it up and use it. Some shooters find new magazines have slightly stiffer springs, which can make loading the last couple of rounds a bit harder initially, but this typically loosens up with normal use. Disassemble and clean it occasionally to keep feeding smooth.
ProMag designs this for range, training, and duty use. That said, if you're carrying the SR40 for defense, most experts recommend function-testing any aftermarket magazine with your actual carry ammunition first. Factory Ruger magazines are still considered the most reliable baseline for defensive carry, though the RUGA37 is a solid backup option for range work and training.
No. SR40 magazines are SR40-specific and won't fit SR9, SR45, or any other Ruger platform. The cartridge dimensions are different, so stick with SR40 or SR40c magazines only.
ProMag backs every magazine with a lifetime warranty against manufacturer defects. If you ever have an issue with the mag, you can return it to ProMag directly for a replacement. This covers material and workmanship defects, not damage from misuse.
| UPC | 708279012785 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | RUGA37 |
| Brand Fit | Ruger |
| Caliber/Gauge | .40 S&W |
| Capacity | 15rd |
| Model | |
| Model Fit | SR |
| Product Type | Detachable |
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