The SOG BTR40 seems to have placed the vision slits (or possibly the chair) in a less functional position. This may be accurate to the vehicle, but it makes the vehicle more challenging to use. In first person you can't really play the vehicle because the slits are too high. In the CSLA one they are low enough to see through, but the SOG model is considerably better with more functionality, but made difficult to play due to the vision issue.
SOG on left CSLA on right