So when I got a minigun, it still uses the old wind-up sound from vanilla FO3, but without the wind-up animation; it fires immediately like in vanilla FNV resulting in a pretty weird situation. I thought it was just for the standard miniguns, but when I use the CZ57 Avenger it also has the same problem.
(EDIT) Another problem is with the Sprtel-Wood 9700. It fires the normal red lasers instead of the unique green of the Sprtel.
I know these bugs are not game-breaking, but they are nonetheless annoying.