This is a completely game-ready model that comes with PBR material maps. Drag and drop into any modern game engine such as Unreal Engine 4, along with the color, nmap and mask maps and you're good to go! The mask map channel layout is as follows:

Red Channel > Roughness
Green Channel > Metalness
Blue Channel > Ambient Occlusion

** Roughness, Metalness, and AO Maps attribute nothing to color, it's only black & white information. As such, each of these can be placed on a separate channel within the same texture file. This reduces draw calls and memory usage. **


Enjoy!!