When not mentioned, I have assumed that any gear is of Common-craftsmanship. However, one of my players has questioned this is a particular case.
The Rogue Trader gets to select either "Best-craftsmanship enforcer light carapace or storm trooper carapace."
I read this as Best-craftsmanship enforcer light carapace or [Common-craftsmanship] storm trooper carapace while he reads it as Best-craftsmanship enforcer light carapace or [best-craftsmanship] storm trooper carapace. He says that the craftsmanship listed should apply to all of the options connected by a conjunction (the "or") unless it is specifically differentiated (as it is in all other cases except the Archmilitant's two bolt pistols option).
So, what level of Craftsmanship do you rule for a Rogue Trader's storm trooper carapace and the Archmilitant's two bolt pistols?