you only need one target lock in a squad of 2 models. The second one does nothing and is a waste of 5 points and a wargear slot.
About Helios, I second what Kelanen said. While they can do it, their purpose is not heavy tank hunting (piranhas, broadsides and TL fusion monats do it way more efficiently). The main purpose of Helios suits is to hunt heavy infantry and monstrous creatures. Also, they need markerlight support to kill their target in one blow due to their short effective range, but watching your opponent's face when his squad of paladins or FNP Blood Angels gets wiped in one volley is priceless.



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wowza im guessing marines do not enjoy facing your army on the battlefield!!
either that or my opponent rolls well on cover saves and i do no damage, we do play with tons of terrain so pretty much everything gets a save.