A sub-machine gun fires pistol cartridges. A machine gun fires rifle rounds.
BB gun. Fires a round BB.
The Railgun, it fires over double the speed of sound.
Artillery
No. They trap and slow the release of gasses after the gun fires.
The advantages of gel fires over log fires is the lack of smoke or smell. Similarly, gel fires can be a cheaper alternative and are slightly safer than log fires.
The Dillon Aero M134 Gatling gun fires either 2000 or 4000 rounds per minute, it is selectable.
Fires affect the weather by causing the smell of burning bodies to waft through the air.
Simple answer, suppressive fires.
The "starter"
My CS-6 Recon Gun fires at different ranges sometimes, but it usually fires a dart about 7 metres
When a gun fires more than 1 shot per pull of the trigger. In most cases, pull the trigger. Gun fires, ejects fired cartridge, loads fresh cartridge, fires it, and repeats until you release the trigger or run out of ammunition.