ProMag Sig Sauer P229 Magazine .40 S&W / .357 Sig Blued Steel 12/rd

The ProMag Sig Sauer P229 Magazine .40 S&W / .357 Sig Blued Steel 12-round is a purpose-built replacement or duty magazine for the Sig Sauer P229 platform in either .40 S&W or .357 Sig caliber. This 12-round magazine provides reliable ammunition storage and feeding for duty carry, training, or range work with a proven semi-automatic pistol platform trusted by law enforcement agencies nationwide.

Constructed from heat-treated blued steel, this magazine features a follower lock-plate and base-plate molded from proprietary DuPont Zytel polymer for reliable feed and durability under duty conditions. The spring is wound from chrome-silicon wire and heat-treated for consistent performance across thousands of rounds. The 12-round capacity balances firepower with reload speed, a configuration standard for .40 S&W and .357 Sig duty pistols. The blued-steel construction resists corrosion in typical indoor and outdoor duty environments while maintaining a low-profile appearance consistent with issued equipment.

This magazine is designed for operators, law enforcement officers, and serious recreational shooters who run the P229 platform and require spare or replacement magazines for duty rotation, training cycles, or load-out standardization. The 12-round capacity is the standard duty configuration for these calibers in the P229, making this an essential logistics item for anyone maintaining multiple P229 pistols or backing up an issued duty weapon.

The P229 platform has remained a workhorse in federal, state, and local law enforcement for over two decades. Aftermarket magazines like this ProMag unit provide cost-effective alternatives for building spare magazine pools without the expense of factory-original magazines, while maintaining compatibility and reliability standards required for duty or competition use.