Okay,

I finally have Ascension so lets start collecting and correcting eratta.

Executer Pistol:
The Armoury page states 2d10+4 X/1d10+5 I while the Eversor Assassin has it stated as 1d10+5 X/1d10
Which is it, I would guess the first otherwise it would "just" be a combi bolter needler.

Makes you also think that 2d10+4 X is the "new" Astartes Bolt damage for the upcoming Death Watch game

Evesor has it stated as d10+5, so its likely just a typo and it is supposed to be 2d10+5 for the bolt aspect.