Apparently, when using the ironsight for the 357 the shots go slightly to the right. This makes long range headshots somewhat difficult.
Also
It seems the scope for the crossbow is also a bit wrong, if you shoot with the scope the darts end up slightly above the middle of the scope. It seems the scope is not in sync with the crosshair.
For example if you aim somewhere and then use the scope, the scope is looking below where you aimed and when you shoot the dart end up where the crosshairs ACTUALLY are.