This is a Gun based on the concept work of Matthew Harris, his permission has been given for the sale of these 3D models.
The turntable and some of the thumbnail shots were taken in Unreal 4.
Textures were created in Substance painter and as such are PBR textures consisting of metalic, roughness, diffuse, normal map with Height and opacity maps thrown in for good measure. there is no emmisive but it is easy enough to generate one using the colour map if you have need of one.
The textures are PNG files and come in at 4096, the logic being that if they need to be reduced then its easy to do after the fact using things like the GIMP or photoshop.