When Team Magic came out with their revised suspension arms for the G4+, they made the rear lower arm length adjustable as shown in the first photo below. The arms seem to have been designed this way, to compensate for the fact that there are only two inner camber link positions - the stock position and one that is up and inward. In order to get a longer camber link, you have to move the rear lower arm position to the inner hole. As you can see from the second photo, the inner camber link positions are incorporated into the rear shock tower mount versus something extreme like the camber plate that is available for the RRR as shown in the third photo below.
It's really interesting to compare what each manufacturer has provided as options for adjusting the inner camber link position and addressing camber gain.
RRR (KM Group after market part)