ProMag SIGA4 .40 S&W/.357 Sig 20-Rd Blued Steel Pistol Magazine for Sig Sauer P226

The ProMag SIGA4 is a 20-round extended pistol magazine purpose-built for the Sig Sauer P226 chambered in either .40 S&W or .357 Sig. Designed as a high-capacity aftermarket magazine, the SIGA4 gives P226 owners extra rounds for range training, duty use, and competition.

The magazine body is constructed from heat-treated steel finished in black oxide (blued) for corrosion resistance and long service life. The follower, lock-plate, and base-plate are molded from Zytel polymer for smooth, reliable feeding, while a chrome-silicon wire spring maintains consistent tension across the full 20-round capacity.

Made in the USA by ProMag Industries, the SIGA4 is a dependable replacement or upgrade magazine for any Sig Sauer P226 in .40 S&W or .357 Sig.