There's a ridiculous amount of variables in all of this -- I'm not saying FPS plays NO effect in range, I'm just saying that it's not as important of a factor in the way that people think it is.
You originally never stated anything about how the guns were built, you simply said:
Originally Posted by Skladfin
FPS + Hop up(Setting) + BB = Range
FPS does play a small part in range, but not nearly as much as a good BB, hop-up and compression parts do.