We are currently working on a whole set of guns that you can use in your games! This one, called the H3, is the first one of the set and it will be distributed for free once finished.
Here is a little preview of the model :
It was modelled and retopologized in 3D Coat and will also be tecture in there. The retopomodel you can see in the video has only about 900 faces so it will be usable in about any game. We might be adding a super low poly version if there is demand for it.