Whenever you're disconnected from a server, it will try to reconnect you to that server. If it can't find that specific server you were playing in, you'll be redirected to another server on that same map. There's a glitch where, when the game redirects you to another server, any restrictions on weapons is gone, hence the people using other weapons in the sniper-only and mellee-only map. So you create a custom Knife Party or Sniper Fort map, and set a password so others can't join it. This is important, because if there are no players in a server (if all the players left), the server is removed, and you will not be able to return to it, thus forcing the game to redirect you to another server. Once you create the custom map, simply disconnect yourself by turning off the Wi-Fi or putting your device on airplane mode.. When you get the reconnecting message, just turn the Wi-Fi back on. You'll be redirected to another server, and when you spawn in that server, you will have access to all your active weapons.