The caution areas I have are:
The handle for the left hand on the long rifle. It's glued in place but weakly, so it popped off on mine. I was gonna super glue it back, but for now I'm keeping it off as it's actually easier to pose his arms with a two-handed pose. I just leave the handle in the gripping hand, and it gives the freedom to make adjustments to his left hand without worrying about breaking.
The other is the forearm guns. They make a creaking noise when I put any pressure on them. Other than moving the sliding cocking part (don't know what it's called) I try not to touch them when posing the arms.