ProMag SMI40 10-Round 9mm Magazine for S&W M&P Shield EZ

The ProMag SMI40 extends your Smith & Wesson M&P Shield EZ capacity to 10 rounds of 9mm ammunition while maintaining the pistol's slim profile. This blued steel magazine delivers reliable feeding and consistent performance for range training and defensive applications.

What Makes This Different

The SMI40 construction uses heat-treated steel with a blued finish that resists corrosion better than standard polymer alternatives. The magazine features a reinforced follower system and precision-wound spring that maintains consistent tension through thousands of loading cycles. Factory specifications ensure proper fit and function with all M&P Shield EZ variants.

Key Features

• 10-round capacity extends standard 8-round magazine by 25%
• Heat-treated blued steel body withstands repeated use
• Precision follower design prevents feeding malfunctions
• Drop-free operation for fast tactical reloads
• Compatible with all S&W M&P Shield EZ 9mm pistols
• Witness holes allow quick round count verification
• Anti-tilt follower maintains cartridge alignment

Range testing demonstrates consistent feeding with various 9mm loads including hollow points, ball ammunition, and +P defensive rounds. The extended capacity proves valuable for competition shooting where stage round counts exceed standard magazine limits. The steel construction handles repeated drops and impacts without cracking or deformation common in polymer magazines.

Technical Specs

• Capacity: 10 rounds of 9mm Luger
• Material: Heat-treated steel with blued finish
• Compatibility: Smith & Wesson M&P Shield EZ 9mm only
• Overall length: Approximately 4.2 inches
• Weight: 3.1 ounces empty
• Spring: Music wire construction
• Country of origin: USA

The SMI40 provides shooters with additional capacity without compromising the Shield EZ's concealability or reliability. ProMag's manufacturing standards ensure consistent dimensions and proper magazine catch engagement for dependable operation.