Rarest of Trash

Why is it that when i do the shooting range stuff it takes away all my stuff like everthing lost. And why are half the guns usless. Grinded to get all this stuff to (lost alot of it at my shelter not even in a game.) And another thing how is it thag the Thomson is OP like OP maybe its just me but more times than not i can have some of the stongesrt load outs get the drop on someone and they double tap me with but just eat my bullets like they candy or something