The Chain Gun is the gun-of-all-seasons, to say the very least. High accuracy and rate of fire make it a good weapon to use anywhere from close to far range situations against almost any low to mid-range foe. Even a Hell Knight can be taken down with less than 5 seconds of concentrated fire. As Chain Gun ammunition is generally hard to find until the player reaches the Delta Labs (and even then is mostly retrieved from the corpses of Chaingun Commandos), it is recommended to use the Plasma Gun first for all levels leading up to the aforementioned level.