I like what you've done here, but still it lacks something, in my opinion the main gun wooden placement should be more deeply mounted within the bullet aceleration upper module, it looks like very hard to hit target with that kind of gun build displacement, the barrel is kinda strange, try to make some iron support that connects the wooden part to 3/4 of it. Like this:
]________ < ] - Projectile aceleration module - Is this red dot on guns front a laser, a ready-to-shot led or a scope ?
]_______() <- Barrel exit
||||////// < / -Iron support connecting to the barrel, improvement of acurancy.
/\
| - Wooden base
I know, this is crazy but i believe it will make your gun look more awesome xP
