It's oem sig sauer, high quality is expected. - SIG SAUER P320 Caliber X-Change Kit, 10 Round Magazine

This xchange kit for the sig p320 was updated and flawless. It was shipped quickly, way before the opticsplanet delivery estimate. Opticsplanet always delivers quickly and works toward reducing the expected delivery window, thanks o p. If this item is on your buy list you will be pleased with it's purchase. Good/Bad side... It comes inside a nice sig case. In the case is the slide assembly in a plastic bag, there is a lot of factory lube all over the slide assembly. Necessary but messy.