Artifice makes: Hilts, Crystals (not just color but stats as well), Upgrade Packages aka Mods (upgrades Weapons & Armor), Shield Generators, and Lightsabers. Cybertech makes: Upgrade Packages aka Mods (some work on both armor and weapons but not all), Droid armor upgrades, Teleporters, Ship Upgrades, Ear implants(The only crew skill that upgrades this slot) Grenades, and speeder bikes. From Torhead.com From what I've seen there are no Barrels in Cybertech. It seems to me to work a lot like Engineering in WOW(pardon equating that evil MMO to this game but its what most people have played).

As force users, Artiface has the mods you are looking for. If you need more clarification Torhead.com has a really good database for your crafting needs. For clarification Cybertech has armor mods Artiface has weapon mods. Weapon mods usually have a bigger influence on stats then armor, but Tor could be the exception.