because it is technically different version, there is something different, it can be addition of another piece, or a change in construction, however designers themselves probably don't regard this as a major version change, since it is probably not hard to change in the cad. The designers probably only regard a major version change when they really alter the shape from the base design.



oh, and another reason, we've been doing this since a couple years ago, when the guhong+ come out, everyone just called it guhong v2 or guhong 2