The well know AK 47 for the blender game engine. You can apply the subsurface if you want to. If you let it to 1 ,for the AK and the trigger, its 24 000 faces in total. Which I think it's not too much for the Blender Game Engine. The principal model is the AK, the reload and the trigger are parented to it if you to animate it. Use it for whatever you want Public Domain of course. Enjoy ! :D
Thanks for that. Hope you've moved forward with your chosen career.