This is a factory SIG P320 10-round magazine, chambered in 9mm.
This magazine also fits full-size SIG P250 pistols.
This SIG P320 10-round magazine features a steel construction, side-facing witness holes, and an impact-resistant polymer baseplate.
Please note that this is a full-size magazine blocked at 10-rounds and will fit in full-size P320/P250 pistols. This Sig Sauer magazine is compliant with States and counties with high capacity restrictions (New York, California, Cook County, etc.).
Having spare magazines for any firearm is a must. Quality magazines don’t go bad, and extra mags allow you to keep your pistol functioning at peak performance.