Hi Ray,
Mine is well behind the 4" mark. I haven't checked it since the first flight but I started out at 3 7/8" and started moving the batteries back until I liked the way it flew. It is probably very near or right on the rear limit of 4 3/4". I like to get my CG far enough aft so very little up elevator is required as the plane is slowed for landing, also little to no input is required on the elevator for inverted flight. Mine needs just a little (very very little) down when inverted to hold the nose up.