How did this KMS player increase his range by such large factors?

it's still in the code though, unless it's been taken out recently

Copy-paste from KMS. Would have cost too much to remove that part of the data.

So it wouldnt be easy for us to get such a high range as the kms players?

That would be correct. Doesn't help that additional options were shot down as an update for GMS. The market has severely suffered because of it. The game would be immensely better if equips had stat variations. More than most people realize.