"R6" designation means it's a kit mounted in the field. what means a A8/R6 is a standard A8 where the outer guns were removed, the underside gun panels were changed to the ones were the wg21 tube could be attached. electrical system for all R-kits was already mounted in factory. plug and play.
when the wg21 were not used, tha mg151 were mounted back on the plane.
Offiical FW documentation does not allow the A8 to be flown without the outer guns in a clean configuration.BUT Field modifications always happened, what means if you remove the outer mg151, you have to compensate the CG with ballast, anyway that wasn't allowed officialy by FW. Try to find the A8's load chart and calculate the weight and the place for the ballast. anyway, it's rather stupid as the weight of the plane will be the same if you compensate with ballast placed in the fuselage, you'll only will a few degress in Rollrate acceleration because of the wing's lower weight.
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