ProMag SMIA23 S&W M&P 20rd 9mm Magazine

Frequently Asked Questions

Is the ProMag SMIA23 reliable for self-defense or duty use?

ProMag magazines are best suited for range training and practice. They have a mixed reputation for reliability and can be inconsistent from one unit to another. For critical applications like self-defense or duty use, stick with OEM Smith and Wesson magazines. If you have a solid primary magazine supply and want to test this for range use, break it in thoroughly before depending on it.

Will this 20-round magazine work with all M&P9 models?

This magazine is designed for the full-size Smith and Wesson M&P9 series. It will not work with the M&P Shield, M&P Shield Plus, or M&P Compact models, which use different magazine specs. Verify your specific M&P9 variant before ordering.

Do I need to break in this magazine before using it?

Some users report these magazines work smoothly right out of the box, while others need to break them in or make adjustments for reliable feeding. It's worth running it through a full session at the range and confirming proper function before counting on it. Magazine springs may feel stiff initially, which is normal and usually improves with use.

What's the difference between the ProMag SMIA23 and the factory S&W M&P magazine?

The main difference is that this ProMag is designed to hold 20 rounds instead of the standard 17. Both use similar construction methods, but OEM Smith and Wesson magazines are generally known for more consistent quality and reliability. The ProMag offers extended capacity at a lower cost if you want additional range mags.

Is this magazine made in the USA?

Yes, the ProMag SMIA23 is made in the USA and backed by a lifetime manufacturer warranty against defects. Magazine springs are precision wound from heat-treated chrome silicone wire with quality checks throughout assembly.