From Zandronum Wiki
This article documents a Zandronum-specific DECORATE feature which may not be supported by ZDoom and its other child ports.

void A_FireRailgun (void)


Starts the flash state and fire a single rail. This rail will do 75 damage in Deathmatch and other PvP gamemodes, and 200 in all other modes. This is different from ZDoom's A_FireRailgun.