Gun similar to Jericho 941 Model 3D

Simple model of gun similar to Jericho 941 gun. The object contains materials, however, they works well only in original .blend file (can be open in Blender 2.76). Still, if you import another object format (3ds, etc.) to other editors (e.g. 3ds max,...), there are material slots with materials, which contains information which parts of objects use which material. Note: whole scene as you can see it on presentation images is not same in files - lighting and background is not included in blend file. Whole geometry contains only triangles, there are no ngon faces. Preview pictures were rendered in Blender cycles.