ProMag SIGA16 Sig Sauer P229 40 S&W/357 Sig 15rd Black Oxide Steel Extended Magazine

The ProMag SIGA16 is a 15-round extended replacement magazine built for the Sig Sauer P229 chambered in 40 S&W and 357 Sig. Designed as a high-capacity spare or replacement stick, this extended magazine gives P229 owners extra rounds on tap for range sessions and defensive use.

The magazine body is constructed from heat-treated steel with a black oxide (blued) finish for strength and corrosion resistance. Inside, the injection-molded polymer follower and chrome-silicone wire spring deliver reliable feeding round after round. The extended profile delivers the full 15-round capacity in a drop-in design for Sig Sauer P229 pistols.

Made in the USA, the SIGA16 is purpose-built as a replacement magazine for factory and aftermarket Sig P229 pistols. Whether you're topping off a duty rotation, stocking spare mags for the range, or replacing a worn-out original, this ProMag extended delivers a cost-effective steel-bodied option.