ProMag’s 12-round magazine is made for the Sig Sauer P229 chambered in .40 S&W and .357 Sig. It combines a heat-treated blued-steel body with polymer components for a balance of durability and weight savings. The follower lock-plate and base-plate are molded from a DuPont Zytel-based black polymer, and the spring is wound from chrome-silicon wire and heat-treated to maintain consistent tension and reliable feeding.
Key Specifications
- Capacity is 12 rounds.
- Compatible with Sig Sauer P229 pistols chambered in the listed calibers.
- Calibers supported are .40 S&W and .357 Sig.
- The body is constructed from heat-treated blued steel.
- The follower lock-plate and base-plate are molded from DuPont Zytel-based black polymer.
- The spring is made from chrome-silicon wire and heat-treated for strength.
- The finish is blued for corrosion resistance and a traditional appearance.
- Manufacturer part number is SIG-A2.
This magazine provides a service-grade replacement option for range use, training, and duty applications where reliable feeding and durable construction are priorities. Its blend of blued-steel construction and polymer components delivers consistent performance and straightforward maintenance in common shooting environments.
