This is a factory SIG P225A-1 8-round magazine, chambered in 9mm.
Trusted by military, police and civilians for decades, SIG SAUER has earned a worldwide reputation for the unquestioned accuracy and unflinching reliability of its pistols and rifles. SIG SAUER magazines provide exceptional fit and reliable feeding in their high quality firearms.
Here is some more information about the new and redesigned P225A-1.
The P225-A1 retains the exceptional look and feel of the original P225, but features an enhanced trigger and the precision manufacturing and quality from the state-of-the-art SIG SAUER facility. The P225-A1 is a single-stack 9mm pistol with the time-tested double-action/single-action trigger system. A fully machined stainless steel slide is finished in the durable Nitron finish. A hard coat anodized frame sports two-piece grips with the SIG mark medallion. A popular concealed carry option in the American market, the P225-A1 is a time-tested performer. The slim slide profile and shorter barrel length is easy to carry yet retains the familiar controls of its full-size batterymate the P226. Featuring the accuracy, reliability and durability of all SIG SAUER products, the P225-A1 combines the elements of the company’s history with the cutting-edge manufacturing of modern day SIG.