[@Dannyrulx]
The lowest level that receives them are Squad leaders (Sergeants, occassionally Lieutenants depending on the regiment). Neither standard bearers nor pyrotechnic officers would be able to actually get them without running into [i]some[/i] sort of trouble. By Codex terms, you're either a Special Weapons Squad member or a Standard bearer, neither of which is entitled to a bolt pistol. It would be obvious it's spoils of war. 

[@NecroKnight]
your words mean naught abhuman! Lalalalala! Not listening!