Players are often getting kicked with this error in Gungame since the last Facepunch Update (9/1).

I have no Gungames event but I got the same problem. when they attack the heli they called from command (customhelicoptertiers) and sometimes got kicked (Kicked: RPC Error in OnProjectileAttack)

the same thing happens to us in gun game expel players

same here, with the gun game event and using firearms