Weapon is always the centered topic of every shooting game, and in DUST 514 where you will play as an infantry, weapons are supposed to have "recognizable roles but used more advanced technologies than the equivalent weapons of today," and "encapsulate the values and technology of the race that created them." Here PlayStation blog gives a preview of the infantry weapons in the game.
Basically, you can use any race's weapon, as long as you think it fits you best, and you can choose from 3 classes of weapons: light, heavy and sidearm. But keep in mind that only when you have learned to use heavy dropsuits can you use the heavy guns. Light weapons are the most common ones in DUST 514 and they are effective at short to medium ranges while Sidearms serve as backup weapons.
In the future warfare, bullet has been replaced by different types of energy, and in DUST 514 use different energy, some guns such as "Gallente G75-VLB Assault Rifle" uses plasma, and some use electric, "Caldari DCMA S-1 Forge Gun", for instance, .
Other than the efficiency and tactical needs, aesthetics is another thing you may consider when choosing a weapon, and PlayStation blog has posted some nice looking guns, attaching with their specifications. Check out here to see the entire article.
