It seems that in the 6th and final season, they got lazy or just didn't care about the effects/continuity editing.
One episode in particular has close ups of the team going through a building. They are all shown one at a time with their weapons up. They all use the exact same angle and show each moving normally while looking through the gun site hood...unfortunate it's all so obviously fake that it
made me freeze it and rewind just to be sure I was actually seeing this. Unlike nearly all the action in this series, even though the agents heads are shown with normal bounce from walking, the portion of the weapon glides on a trolley with no waver or movement whatsoever.!