This is a factory .40 S&W/.357 Sig 18-round magazine for Sig P320/P250 pistols.

Sig Sauer’s P320 pistol (based on the P250 frame) is the Army’s new sidearm of choice, and the ultimate in striker-fired, modular handguns—thanks in no small part to its reliable factory magazine.

These magazines deliver the ultimate combination of firepower and capacity with 18 rounds of .40 S&W/.357 Sig, carbon steel construction, and a special polymer baseplate. Perfect for home defense or trips to the range, the extended capacity could make all the difference when you need it most.

Polymer baseplate fits flush with full-size P250/P320 pistols, but the magazine will also function with smaller models.