It's worth pointing out that actual Adeptus-grade weapons, according to Deathwatch, are exceedingly difficult for non-Space Marines to obtain - there's a whole sidebar about it on P.146 of the DW Core Book, appropriately titled "Man's Reach Exceeds His Grasp". It starts off by saying that Astartes weaponry "should require considerable effort, and not just be an Acquisition or Influence test".<br/>-Even once you get one, they count as one full grade heavier than normal (Pistols are Basic, Basic weapons like Bolters are Heavy, and so on - an Astartes Heavy Bolter would be unwieldable by a person).<br/>-They impose a permanent -30 penalty on Tests with them due to improper sizing, bulkiness, recoil, and weight, even for someone in power armor.<br/>-The machine spirits of such items instinctively rebel against non-Astartes users, allowing the GM optional checks - examples being Toughness tests to avoid randomly vented heat venting from a plasma gun, or a power weapon causing shocking feedback.