Dual Shot from the Errata

Something none of us use (but i will be) and something phenomenally interesting (should be usefull for you, sila)

"As you are firing both guns as a single attack you may take an aim action before firing to get a +10 or +20 bonus to the BS test. A red dot laser sight mounted on either gun will provide its +10 bonus. You do not suffer from the normal -20 BS pentalty for weilding two weapons. if you hit, the targets armor gets applied as normal to both hits individually, but the toughness only counts once against the combined damage rolls of both hits. a single successful dodge test from the target will avoid both shots."