This is a factory IWI US Jericho 941 10 round magazine in 9mm.

This magazine features stainless steel construction, side-facing witness holes, and a polymer base pad.

More information about the IWI Jericho pistol:

The IWI Jericho pistol is a semi-automatic handgun produced by Israel Weapon Industries (IWI). It is a variant of the CZ 75 pistol, which was originally designed in Czechoslovakia in 1975. The Jericho has been in production since the 1990s and has been used by various military and law enforcement agencies around the world.

The Jericho is available in a range of calibers, including 9mm, .40 S&W, and .45 ACP. It features a steel frame, a polymer grip, and a double-action/single-action (DA/SA) trigger. The pistol also has a slide-mounted safety and a decocking lever.