Rex, I think your right. The size does seem a bit smaller for some reason. Have you checked the measurements yet? Would that be an easier build/conversion to do than the M37 turret or the short 75 on the LVTa4? I only say this because I am thinking about doing an a4 after I get the LVTH6 done with the 105. I have been playing with a turret for it for 9 months now, or longer, and it is time for that baby to hatch.