Promag Smia24 20Rd 9Mm Fits S&W Csx Blued 4140 Heat Treated Steel

The ProMag SMIA24 is a 20-round magazine built for the S&W CSX 9mm pistol. If you're looking to maximize your CSX's capacity on the range or in the field, this is a straightforward upgrade from the factory standard. ProMag magazines are known for reliable feeding and durable construction—they're a practical, no-fuss choice when you want spare magazines without breaking the bank.

This magazine is manufactured from 4140 heat-treated steel, a material selection that balances strength and longevity. The blued finish ties in with the classic aesthetic of the CSX while offering corrosion resistance for everyday use. At 20 rounds, it nearly doubles the CSX's typical factory capacity, giving you more trigger time between reloads whether you're doing duty practice or working up loads at the bench.

ProMag has been supplying aftermarket magazines for decades, and they build with the understanding that shooters need reliability without premium pricing. This SMIA24 is purpose-built for CSX compatibility—fit and feed are engineered specifically for that platform, so you can load and shoot with confidence. Keep one in your bag, in the range box, or rotate them through your duty rig for consistent, dependable performance.

Key Features

• 20-round capacity for the S&W CSX 9mm
• Constructed from 4140 heat-treated steel for durability
• Blued finish for corrosion resistance
• Direct fit and feed compatibility with CSX platform

Specifications

Frequently Asked Questions

Will this ProMag magazine work with my S&W CSX?

Yes. The SMIA24 is engineered specifically for the S&W CSX 9mm platform. It's a direct fit with no gunsmithing or modification required.

How many rounds does the SMIA24 hold?

The SMIA24 holds 20 rounds of 9mm ammunition, compared to the CSX's standard capacity.

What material is this magazine made from?

The SMIA24 is constructed from 4140 heat-treated steel with a blued finish, providing both strength and corrosion resistance for reliable long-term use.

Is this a factory S&W magazine or aftermarket?

This is an aftermarket ProMag magazine, not an OEM S&W factory magazine. ProMag specializes in reliable, budget-friendly spare magazines for a wide range of firearms.