AI has no collision

Ok so really noob question I’m new to UE4, I have an AI that spawns and chases me around the map but I can’t fire at him with line trace and he has no collision so I can walk straight through him, I’m really not sure what has gone wrong the mesh has a physics object etc I’ll post my collision settings (they are probably really f’d up because ive been hopelessly changing a lot of them). The character is something i purchased off the market place, should note that until i messed with settings i wasnt able to walk through him, but i still couldnt shoot at him (however i can the ground and the walls? - similar with a lot of meshes ive put in my scene, line trace doesn’t fire at them)