This Kitbash set includes 4 barrels, 4 cylinders, 4 bodies, and 4 grips, allowing you to combine different parts, to get a large amount of different guns, Borderlands style. It also includes some floating geometry, so you can move, scale, and place details wherever you want, for your normal/ao/cavity maps, on your final low poly.
It comes in .Max (3DS Max 2011, or later) FBX, and OBJ formats, packed in the one RAR file. This is a high res set, intended to allow you to combine different pieces, into a high res gun, you can then do the low poly work on. There are no low poly elements included.
You can buy it here: https://cubebrush.co/replica63/products/tejbja-I13T