ProMag Ruger SR40 .40 S&W 10-Round Magazine

The ProMag magazine (manufacturer part number RUG 21) is a 10-round .40 S&W magazine for the Ruger SR40.

Key Specifications

• Holds 10 rounds of .40 S&W.
• Compatible with Ruger SR40.
• Manufactured by ProMag.
• Measures approximately 9.3 inches in overall length.
• Weighs about 0.27 lb shipped.
• The .40 S&W chambering is short for .40 Smith & Wesson.
• Ships empty — no ammunition is included.
• A direct-fit replacement or spare magazine, not a loader or extension accessory.
• Always confirm exact model/variant fitment against your specific firearm before ordering.

Frequently Asked Questions

What does this magazine fit? It’s built for Ruger SR40. Always confirm your exact model/variant before ordering, since magazine fitment can vary by generation.

What’s the capacity and caliber? It holds 10 rounds of .40 S&W.

Buy the ProMag Ruger SR40 .40 S&W 10-Round Magazine

Ships fast from a Lubbock, TX gun shop on the ProMag Ruger SR40 .40 S&W 10-Round Magazine from ProMag, part of our Handgun Magazines selection. Pick up a dependable spare or replacement magazine.