A model created for either 3D printing or game use etc. If you want to print, you can adjust the thickness with the shell modifier, remove this modifier if you don't want to print, to reduce polys. Bear in mind that the ammo cartridge is a separate object that slides into the gun via a small runner clip, you may want to print a smaller version of the objects to test that ammo fits in and stays in. The gun barrel has a hole to allow excess print material to escape as is usually advised for hollow objects.