Goddamn you're SO stupid, yet you act so smart.
You COULD check basic hacking forums.
System.mrs contains vital server information, therefore they have to be made for server's individually.

System.mrss for DarkGunz work these days, MocroGunz, and other smaller servers.
A lot of them can only be used for questing.
They won't work on Trinity, except for a few kids who med hack, but that gets caught fast.