C-10 rifle

The Canister Rifle is the standard issue weapon of Terran Ghosts. There are a few known variants;

C-10 Canister Rifle
The C-10 Canister Rifle is a rifle used by Terran Ghosts that functions in a similar manner to a shotgun, albeit with high range and accuracy. It fires 25mm explosive rounds (canisters). These appear to be charged by energy rather than having an explosive yield, in that the rifle can be charged to deliver the rounds with increased power-enough to destroy a Siege Tank from the inside.

The rifle can also fire special lockdown rounds, which temporarily disable mechanical units. In addition, it can be fitted with a frequency targeting laser used to 'paint' targets for nuclear strikes.

C-20A Cannister Rifle
The C-20A Canister Rifle was featured in early builds of StarCraft: Ghost, replacing the C-10 as the standard issue weapon for Ghosts. It was later replaced in functionality by the AGR-14 and its appearance seemingly forming the basis of the Submachine Gun. It had three main functions; sniper, grenade launcher and assault rifle.
 * Sniper Mode: By attaching a scope, the C-20A effectively becomes a sniper rifle. It gives info on the target such as health, range and whether they can be locked down.
 * Assault Rifle Mode: Effective at close range, it emits little sound and has 24 bullets to a magazine.
 * Grenade Launcher: The C-20A, when set to this mode, can fire a variety of grenades;


 * EMP Grenade: Disables enemy shields.
 * Flash Grenade: Used for stunning enemies.
 * Hellfire Grenade: Breaks up into numerous pieces that track heat sources and then explode.
 * Irradiate Grenade: Emits powerful radiation that is extremely deadly to living organisms.
 * Lockdown Grenade: Disable mechanical units and structures.
 * Sticky Grenade: 'Sticks' to enemies or surfaces before detonating.

Because the C-20A appears only in early builds of StarCraft: Ghost, not to mention that the C-10 is still used by Ghosts in StarCraft II, it should not necessarily be taken as canon.