Here is a Low Poly Stapler. The Triangle count is around 500. It should be suitable to the game engine, and should export and handle well with Unity and Unreal Engine 4. If you plane to use it with a game engine and require other maps (Curvature, AO, etc.) Please contact me and I can provide those maps.

It was modeled in Blender. The normals were baked in xNormal, and the texturing was done in Ddo 2.
The PBR Node setup is courtesy of Andrew Price.

Please let me know what you think, in the comments.