Base guns - 
Assault rifle - AK (Luxe - RPK)
Carbine rifle - M4
SMG - MP5
Pistol - Beretta 
Combat pistol - Glock (Luxe - USP)
Vintage pistol - Five-seveN
Heavy pistol - 1911
Pistol50 - Deagle
Appistol - Glock 18C (Luxe - APS)
Assault SMG - P90

Compact rifle - 
Option - AK74M or vz58

Some mk2 - 
Assault rifle mk2 - AK400 (mags - AK12, AK15, AK19)
Carbine rifle mk2 - Galil (buggy - alpha)
Pistol mk2 - P226
SMG mk2 - UMP (mags - UMP45 (soon UMP40 and UMP9)

Bullpup rifle - Famas

Special carbine - G36


INSTALLATION

Base guns:mods/update/update.rpf/common/data/ai

Bullpup rifle:mods/update/update.rpf
              mods/x64w/dlcpacks/mpbusiness2/dlc.rpf/common/data/ai

Some mk2:mods/update/x64/dlcpacks/mpgunrunning/dlc.rpf/common/data/ai
         mods/update/update.rpf/dlc_patch/mpgunrunning/common/data/ai

Special carbine:mods/update/update.rpf/dlc_patch/mpbusiness/common/data/ai
                mods/x64w/dlcpacks/mpbusiness/dlc.rpf/common/data/ai

Compact rifle:mods/update/update.rpf/dlc_patch/mplowrider2/common/data/ai
              mods/update/x64/dlcpacks/mplowrdider2/dlc.rpf/common/data/ai