ProMag SIG21 9mm Luger Sig Sauer P938 10rd Black Oxide Steel Detachable Magazine

The ProMag SIG21 is a factory-pattern replacement magazine built for the Sig Sauer P938 micro-compact pistol. This 9mm Luger magazine holds 10 rounds and is engineered as a reliable spare or upgrade for everyday carry and range use.

The body is constructed from heat-treated steel with a black oxide (blued) finish for durability and corrosion resistance, paired with an injection molded polymer follower for smooth feeding. The detachable single-stack design mirrors the factory P938 magazine profile for proper fit and function. Made in the USA.