ProMag Sig Sauer P229 Magazine .40 S&W / .357 Sig 12-Rd

This ProMag magazine is made for the Sig Sauer P229 and is listed for use with both .40 S&W and .357 Sig cartridges. It holds 12 rounds and features a blued steel body with polymer locking components. Construction details indicate a heat-treated spring and polymer follower and base for reliable feeding.

Key Specifications

• The brand is ProMag.
• Compatible with the Sig Sauer P229 pistol.
• Caliber(s): .40 S&W / .357 Sig.
• Capacity: 12 rounds.
• Body material: heat-treated blued steel.
• Follower and base-plate material: DuPont Zytel-based black polymer.
• Spring: chrome-silicon wire, heat-treated.
• Finish: blued.
• Manufacturer part number: SIG-A2 (as listed by source).
• Weight: 0.2 (unit not specified by source).

Built with common service materials and straightforward specifications, this magazine is a practical replacement or spare for users of the Sig Sauer P229 in the listed calibers. Its steel body with polymer components and a heat-treated spring provide a balance of durability and consistent feeding for range use and everyday carry configurations where the platform and calibers apply.