Also considering 40k i don't think a storm bolter is out of line for a human. Remember that the bolt weapons are separated into human and astardes versions. its not like you are using the same guns terminators use. Bolt weapons of all types are used by humans in all the literature.

Necron blade tho. Wut. lore wise yea big boo boo HOWEVER considering the nature of the game it's hardly crime of the century. It can easily be taken as extra fluff for a character. I mean its effectively just a unique power sword in the end. Just don't wave it around orthidox inquisitors if you aren't a fan of old pokie.