
"Some weapons can be used in different ways, representing different power settings or types of ammo. Some weapons can be used in combat as well as shooting. Where this is the case, there will be a separate line in the weapon's profile for each, and you can choose which to use each turn."
This is brand new for this edition; I went back and double-checked the 5th book but this was not in there. So, I then checked the FAQ's and the Eldar codex, and there was no other clarification.
Otherwise, it's looking like Arjac's hammer, Singing Spears, OMFG PISTOLS, and anything else that works in the two phases (the Burna is already covered by the Ork codex...stands the test of time!) can only ever be used in the shooting phase or assault phase of a given turn, but not both in the same turn. That is a sad, mega nerf and I don't like it, but can't do anything about it.
WHY DIDN'T THEY REALIZE THIS WHEN WRITING IT???
Or maybe they did...
It does apply, because the pistol has two profiles, its shooting profile and its melee profile. "and you can choose which to use each turn". The context doesn't say only ranged or melee weapons, it's just all weapons in the game.
WOW what a change this is going to make...