Heartbeat skins

I know the horde boss mode u get the torque and boom skins where can I get the others ? sorry if this has been asked

They were with special events and it was a few of them only. I think Boltok, Langer, Longshot, Snub. Might be another one in there but I honestly can’t remember. You will have to wait until they release them again via an event or through the live streams so I wouldn’t count on it happening anytime soon.