I stated that DH/RT have some inconsistencies with the actual fluff, it's nothing scatter laser-size, but it's pretty widespread and I'd say that their canon is a little off.
Case in point is for instance the needle weapons, they went from elaborate las variants (the pistol being even rarer than the rifle, a la inferno pistol/meltagun) carrying extra poisonous package to syringe gun that would look silly even in the hands of an Ork Dok or Fabius Bile.