ProMag SMI27 S&W M&P Shield 9mm 8-Round Magazine Blued Steel

The ProMag SMI27 delivers reliable feeding and extended capacity for Smith & Wesson M&P Shield pistols in 9mm Luger. This 8-round magazine provides two additional rounds compared to factory 6-round magazines while maintaining the compact profile essential for concealed carry applications.

What Makes This Different

The SMI27 uses heat-treated blued steel construction rather than polymer, providing enhanced durability under repeated loading cycles. The steel body resists deformation from drops or impacts that can compromise polymer magazines. ProMag's spring tension calibration ensures consistent feeding across various 9mm ammunition weights from 115 to 147 grains.

Key Features

• 8-round capacity increases firepower by 33% over standard 6-round magazines
• Heat-treated blued steel body withstands 10,000+ loading cycles
• Compatible with all S&W M&P Shield 9mm variants including 1.0 and 2.0 models
• Anti-tilt follower prevents nose-diving and double-feeds
• Removable floorplate allows thorough cleaning and maintenance
• Witness holes at rounds 2, 4, 6, and 8 for quick capacity verification
• Fits standard M&P Shield holsters without modification

Field testing demonstrates reliable function across temperature ranges from -20°F to 140°F without spring fatigue or feeding issues. The magazine locks securely into the pistol frame with positive retention that prevents accidental release during dynamic shooting. Competition shooters report consistent feeding through 500+ round training sessions without cleaning.

Technical Specs

• Capacity: 8 rounds of 9mm Luger
• Overall Length: 4.2 inches
• Body Material: Heat-treated blued carbon steel
• Spring: Music wire with polymer follower
• Base Plate: Removable polymer construction
• Weight: 3.2 ounces empty
• Compatibility: S&W M&P Shield 9mm (all generations)
• Country of Origin: USA

The SMI27 represents proven magazine technology adapted specifically for the M&P Shield platform. Law enforcement agencies and civilian carriers rely on ProMag's manufacturing standards for backup and duty magazines. This extended capacity magazine ships ready for immediate use with no break-in period required.