Cause according to the wiki and in-game, whizkid 2 should allow you to mod an assembly and twice now I haven't been able to do so. The first game I thought, "oh, I used 2 powers to make this, guess I can't add another power to it" but in my most recent game I couldn't put anything on a tactical shotgun, even with whizkid 2. Is this a bug or has no one updated the wiki+in-game text to say you can't do that anymore?