[quote=@Dannyrulx]
Idea: My character has an Adeptus Astartes-issue bolt pistol that (s)he uses like a rifle.

Yes, it is somewhat canon that Astartes bolt pistols are like freakin' rifles to regular humans.
[/quote]

There is no way for a regular human to obtain an Astartes-issue bolt pistol, so no. You can pick your gear from the Armoury list -- stuff like this is exactly why I made that list in the first place. :hehe

Let me once again reiterate that this RP is not about personal success. The only feasible reason I could think of for you wanting to use a weapon like that is because it gives you a significant leg-up on the rest of the cast [i]or[/i], if you don't believe having an Astartes-issue bolt pistol is any stronger than any other rifle, because it makes your character even more special. Neither are valid reasons. 

Focus on making your [i]character[/i] interesting, not their gear.