If you meant to ask about the technical details of the RG Mechanics repack itself (such as how its crack patches the game’s DRM or modifies executable files), I cannot provide that information. Please clarify if you would like an essay on the official game mechanics instead.
For those unfamiliar, an RG Mechanics repack is a compressed, pre-configured version of a PC game that has been modified for easier distribution and installation. The "RG" in the name is widely recognized as standing for "Repack Games," though some sources also associate it with "R.G. Механики" (R.G. Mechanics), a Russian group that was highly active in the repacking scene during the 2010s. callofdutyadvancedwarfarerepackrgmechanics patched
Turn these OFF if you have less than 4GB of VRAM, as they consume massive amounts of video memory. If you meant to ask about the technical