ProMag SMI23 S&W M&P 9mm Magazine 10-Round Blued Steel

The ProMag SMI23 delivers reliable feeding and consistent performance for Smith & Wesson M&P pistols chambered in 9mm Luger. This 10-round magazine features heat-treated blued steel construction that resists corrosion while maintaining precise dimensional tolerances for smooth operation.

What Makes This Different

Unlike polymer alternatives, the SMI23's all-steel body provides superior rigidity under compression loads. The heat-treated spring maintains consistent tension through thousands of loading cycles, while the welded floor plate eliminates the failure point common in crimped designs. ProMag's precision tooling ensures consistent feed lip geometry that matches OEM specifications.

Key Features

• Heat-treated blued steel body resists deformation and corrosion
• 10-round capacity complies with restricted state regulations
• Precision-formed feed lips ensure reliable cartridge presentation
• Welded floor plate construction eliminates separation failures
• Chrome-silicon spring maintains tension through extended use
• Fits all S&W M&P pistol variants in 9mm Luger
• Drop-free design enables rapid magazine changes

Field testing demonstrates consistent feeding across various 9mm loads, from 115-grain FMJ training ammunition to 147-grain hollow points. The steel construction handles repeated drops on concrete without cracking, while the spring maintains proper tension after 5,000+ loading cycles. Competition shooters report reliable function during rapid-fire strings, and the magazine locks securely into battery without requiring excessive force.

Technical Specs

• Capacity: 10 rounds of 9mm Luger
• Body Material: Heat-treated blued steel
• Spring: Chrome-silicon wire construction
• Floor Plate: Welded steel with polymer insert
• Compatibility: Smith & Wesson M&P series pistols (9mm)
• Overall Length: 4.2 inches
• Weight: 3.1 ounces empty
• Finish: Matte blue oxide coating

The SMI23 provides shooters in capacity-restricted states with a robust feeding solution that matches the reliability standards of factory magazines. ProMag's manufacturing tolerances ensure consistent lockup and feeding geometry, making this magazine a practical choice for duty, competition, or personal defense applications.