I originally designed this weapon to be used in the game Fallout 4 as a mod, so it's kinda of a 'low fi' desgin. I made it have two barrels thinking about alternating between each one when firing in automatic mode. It's a low poly vr ready model, and has several attachments that you can swap to your liking:
I offer here the low and high poly models for baking (obj and fbx), the final ingame model (obj and fbx), all textures (PBR, unity, unreal) and substance painter file. Made with 3ds max, each attachment in it's own layer. All models should be linked to the Main object (just select the ring around the trigger, that's the main object).I also made a simple 'shooting' animation contained in the low poly FBX file.
Any questions let me know :)