ProMag SMIA21 12-Round .22 LR Magazine for S&W M&P Compact Blued

The ProMag SMIA21 magazine delivers reliable feeding and extended capacity for Smith & Wesson M&P .22 Compact pistols. This 12-round magazine extends shooting sessions while maintaining the compact profile essential for concealed carry and training applications.

What Makes This Different

Unlike factory 10-round magazines, the SMIA21 provides 20% more capacity without compromising reliability or adding excessive length. The blued steel construction offers superior durability compared to polymer alternatives, while the heat-treated spring maintains consistent tension through thousands of loading cycles. ProMag's proven follower design reduces jamming and ensures smooth cartridge presentation.

Key Features

• 12-round capacity increases shooting time between reloads
• Blued carbon steel body resists corrosion and impact damage
• Heat-treated chrome silicon spring maintains tension over time
• Anti-tilt follower prevents nose-diving and feeding issues
• Fits Smith & Wesson M&P .22 Compact pistols perfectly
• Removable floorplate allows easy disassembly for cleaning
• Witness holes provide quick round count verification

Range testing confirms consistent feeding with standard velocity .22 LR ammunition from major manufacturers. The magazine functions reliably in competitive shooting scenarios where rapid reloads are essential. Cold weather performance remains stable due to the steel construction and quality spring materials. Training applications benefit from the extended capacity, reducing reload frequency during drills.

Technical Specs

• Capacity: 12 rounds of .22 Long Rifle
• Compatibility: Smith & Wesson M&P .22 Compact
• Construction: Blued carbon steel body
• Spring: Heat-treated chrome silicon wire
• Follower: Anti-tilt polymer design
• Overall length: Approximately 4.2 inches
• Weight: 3.1 ounces empty
• Country of origin: USA

This magazine addresses the common need for extended capacity without sacrificing the M&P Compact's concealability. ProMag's manufacturing standards ensure drop-free reliability when the magazine release is activated. Quality control testing validates each magazine's dimensional accuracy and spring performance before shipping.