All Astartes in power armor are able to wield basic weapons without penalty (see page 140; description of basic weapons and page 161; description of Recoil Supression), but not use them in Close Combat. So, if a Space Marine had the Two-Weapon Wielder (Ballistics) talent, would he be able to weild two Basic weapons? The description of the talent specifies that the talent works for two weapons of the same type, which I take it to mean it means either two melee weapons, two pistols, or two basic weapons. Furthermore, page 246; which details the rules for Two-Weapon Fighting, doesn't say anything specifically against wielding two basic weapons, and goes on to state that any weapon which can reasonably be used in one hand apply for this option.
From that, I'm inclined to believe that it's possible to dual wield basic weapons, but every talent for dual wielding ranged weapons applies specifically to pistols, as if nobody in their right mind would fight with two basic weapons, so I thought maybe I'm seeing a loophole where there is none. So I'd like to know if you think that combining Two-Weapon Fighting and basic weapons is at all possible, or not.