This mod edits the spawning loadout file for the Heavy Assault Rifle so you spawn with a Chaingun instead. It fully works and collecting ammo will fill up the chaingun as well. Secondary fire/weapon mod makes the chaingun spin up and fire faster. Optionally in the files I've also included a mod that will change the loadout screen to say Chaingun and the scope description to a charge fire rate description. The text changing mod is incompatible with any mod that also changes strings, because it changes the same file. Install with DOOMExtract.