you can't it's mechanical and resistant to bullets

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3047373358&searchtext=armored
this mod might work

i think in the settings for this addon theres a box thats checked called something along the lines of "effect fleshy npcs only" im prety sure it doesnt exactly say that but its something alone the lines of it, uncheck it and try

its a robot.