What is 2G-ACM?

This site is aimed at hosting a derivative, 'International' version of the rules for Two-Gun Action Challenge Match (2G-ACM) dynamic shooting matches, as popularised in the InRangeTV videos on Youtube hosted by Karl Kasarda and Ian McCollum.

The original 2G-ACM rules are outlined on the Two Gun Action Challenge Match website, though these rules have a couple of issues.  They are on multiple, separate web pages (which isn't as clear or concise as it could be), they aren't numbered (to permit internal references to other, important sections) and some sections could be written to be clearer, or to be more generic (not specific to the founding club's range rules or range template).