This model was baked normal from my high poly model.
So this model is keeping high detail in pre-render and realtime render(high graphic game).
These images are rendered by Cinema4D with simple lighting not AO/GI and default material.
This model not need heavy rendering software by high detail textures(diffuse/normal/specular).
I made textures from a little dirty image.
Stock can move to open and close with rotation. And dot signt, railcover and grip can be detach.

*adout normalmap
If you use 3DSMax/Blender (height=Z), plz use "mp5_ddn.tga".
If you use Cinema4D/Maya ((height=Y), plz use "mp5_ddn_maya_c4d".