Installation:
1. mods\update\x64\dlcpacks\mpgunrunning\dlc.rpf\x64\models\cdimages\weapons.rpf

2. mods\update\x64\dlcpacks\mpchristmas2018\dlc.rpf\x64\models\cdimages\weapons.rpf

3. mods\update\x64\dlcpacks\mpchristmas2018\dlc.rpf\x64\models\cdimages\weapons.rpf

Models from
Terminator Resistance
Terminator Genisys: Guardian