I don't have Star Wars, but OGL D6 Space (which I understand is a revised version of the same game, setting removed) has two relevant sections.
Multiple Actions
"Only equipment and weapons suited for quick multiple actions may be used several times (up to the limit
of their capabilities) in a round. Some examples include semi-automatic guns or items with little or no reload
time, like hands or small melee weapons. A character may not rely on any skill or attribute reduced to zero." - D6 Space, p.58-59
Categories of Firearms
"Most pistols hold between six and 15 rounds. Pistols may always fire once per round, and twice if they are semi-automatic and the user shoots at the same target (with the single fire as multi combat option). Pistols cannot fire full auto — a pistol that can do that is classified as a submachine gun in these rules." - D6 Space, p.107
"As with pistols, rifles may fire once per round or twice if they are semi-automatic (using the single fire as multi combat option). They cannot fire on full auto, since that is the province of assault rifles." - D6 Space, p.108
"There are many single-shot and pump-action shotguns available. The “double-barrel” shotgun can gain the single fire as multi bonus by firing both barrels at once." - D6 Space, p.109
"While most submachine guns hold around 20 or 30 rounds, their rate of fire is so high that they unload themselves quickly. A burst fires about one-fifth of the weapon’s magazine, while a full auto shot
discharges the whole clip. Even so, a full auto shot usually settles most differences between parties quite quickly. Submachine guns may fire at up to three targets per round." - D6 Space, p.109
"Characters may fire [assault rifles] in bursts of three to five rounds (burst fire as single), single-shot, full auto, or single fire as multi. They may fire at up to three targets per round." - D6 Space, p.109
"[Machine guns] may fire at up to three targets per round. Machine guns are almost always belt or drum-fed, meaning they can hold hundreds of rounds. However, many machine guns have cyclic rates of over 500 rounds per minute. They seldom fire on anything but full auto, unless they are loaded with only one round." - D6 Space, p.109
"[Energy weapon h]andguns and rifles may fire single shot (at up to three targets) or single fire as multi,
unless otherwise noted in their description." - D6 Space, p.109
"Personal blasters may only fire once per round (having a longer than normal recharging time)." - D6 Space, p.109
"Plasma rifles and pistols fire a bust of super-heated gas. The clip contains the gas and a disposable battery to charge the electromagnetic pulse of the weapon. These weapons may fire single shot, single fire as
multi, or full auto." - D6 Space, p.109
"Needler rifles and pistols use electromagnetism to fire tiny steel darts at hypersonic speeds. They do not do as much damage as some other weapons, but have huge ammunition capacities. These weapons may also fire single shot, single fire as multi, or full auto." - D6 Space, p.109