Just replace the original map in halo trial with this mod map and start a multiplayer game. Then when you shoot a gun on the map it will be rockets.
Just open Halo trials file location, click on the maps folder, then just replace the original map with the mod map and start a multiplayer game and there's unlimited ammo.
TM Fracture. a wide spread Valhalla type map, with endless multilayer fun, big battles, and much more. For Halo: Custom Edition.