ProMag SIG21 P938 Magazine 10rd 9mm Luger Blued Steel

The ProMag SIG21 Standard magazine delivers reliable feeding and consistent performance for Sig Sauer P938 pistols. This 10-round capacity magazine addresses the need for additional magazines while maintaining the compact profile essential for concealed carry applications.

What Makes This Different

Unlike polymer alternatives, this magazine features blued steel construction that resists deformation under stress and maintains dimensional stability over thousands of loading cycles. The heat-treated steel body provides superior durability compared to standard aluminum magazines, while the precision-formed feed lips ensure consistent cartridge presentation. Factory-style dimensions guarantee proper fit and function without modification to the pistol's grip frame.

Key Features

• 10-round capacity maximizes ammunition while maintaining concealability
• Blued steel construction resists corrosion and impact damage
• Heat-treated steel feed lips prevent spreading and cracking
• Chrome silicon spring provides consistent tension over extended use
• Anti-tilt follower design eliminates feeding malfunctions
• Factory-specification dimensions ensure drop-free reliability
• Removable floor plate allows complete disassembly for cleaning

Field testing demonstrates reliable function across various ammunition weights from 115 to 147 grains. The magazine maintains consistent feeding geometry whether loaded to full capacity or partially loaded during extended carry periods. Law enforcement and civilian users report dependable performance in temperature ranges from -20°F to 140°F, with the steel construction showing minimal expansion or contraction effects.

Technical Specs

• Caliber: 9mm Luger
• Capacity: 10 rounds
• Compatibility: Sig Sauer P938 pistols
• Body Material: Blued carbon steel
• Spring: Chrome silicon wire
• Follower: High-impact polymer with anti-tilt design
• Overall Length: 4.2 inches
• Weight: 3.1 ounces (empty)
• Country of Origin: United States

This magazine represents a cost-effective solution for shooters requiring additional capacity without compromising reliability. The proven steel construction and quality components justify the investment for both recreational and professional applications.