Trying to understand how Range Bands work

So I'm looking over the rules and I'm seeing that the weapons have different range band numbers, such as the Bogan with a range band of 6.

What I'm confused on, and I can't seem to find an answer to in the 48-page PDF rulebook, is what are the range bands? Like, if I shoot at an enemy that is 8 inches away with a weapon that has a 6 inch range, do I take a 2 range band negative modifier?