ProMag SIG03 Sig Sauer P226 Magazine 10rd 9mm Blue Steel

The ProMag SIG03 delivers reliable feeding and consistent performance for Sig Sauer P226 pistols in 9mm Luger. This 10-round magazine features heat-treated blue steel construction that maintains dimensional stability under extended use.

What Makes This Different

Unlike polymer alternatives, the SIG03 uses heat-treated steel construction that resists deformation under spring pressure over time. The magazine body maintains consistent internal dimensions, reducing feed lip spread that can cause malfunctions. ProMag engineers this magazine to meet original equipment dimensional tolerances, ensuring proper lockup and ejection timing.

Key Features

• Heat-treated blue steel body resists corrosion and dimensional changes
• 10-round capacity complies with restricted jurisdictions
• Chrome silicon spring maintains consistent tension through 10,000+ cycles
• Anti-tilt follower design prevents nose-diving and double feeds
• Precision-formed feed lips ensure consistent cartridge presentation
• Drop-free design allows rapid magazine changes
• Compatible with all Sig Sauer P226 variants in 9mm Luger

Field testing demonstrates reliable function with both 115-grain and 147-grain 9mm ammunition across temperature ranges from -10°F to 140°F. The steel construction handles repeated loading cycles without spring fatigue, maintaining feeding reliability through extended training sessions. Law enforcement agencies report consistent performance in duty applications where magazine reliability directly impacts officer safety.

Technical Specs

• Capacity: 10 rounds
• Caliber: 9mm Luger/9x19 Parabellum
• Material: Heat-treated blue steel body
• Spring: Chrome silicon wire
• Follower: High-impact polymer with anti-tilt design
• Compatibility: Sig Sauer P226 (all variants)
• Finish: Blued steel exterior
• Country of Origin: USA

The SIG03 provides shooters with a cost-effective alternative to factory magazines without compromising reliability standards. ProMag backs this magazine with their standard warranty, giving users confidence in long-term performance.