Hey Gino, noticed that your measurement recommendation for the Vader ESB is seemingly shorter than most official iterations I've seen, including the MR limited editions. The grips on those things look almost like they're 115+ millimeters while your measurement translates to around 108mm.
Now I understand for sure that MR LE's are not to be used as the be all end all barometer for accuracy, but I just want to ascertain what source material you referred to in order to determine your 4.25" measurement, since Wannawanga's measurement is even shorter at 104mm.