What is unique or rare about the VM Zodiac signs?

[Wladimir D]

The basic location of the trigger closer to the spearhead of the arrow is possible.
The first scheme is simple. But with it the process of preparing for shooting is the reverse. When charging, it is necessary to strongly fix the trigger to the butt. And at shooting it is necessary to lower the trigger. For accurate shooting, you need to use two hands.
The second scheme is a bit more complicated. But I do not see its advantages in comparison with the classical arrangement. In addition, instead of the shown spring, an additional wedge (fuse) is required.
To get rid of the additional wedge, it is necessary to move the nut lock to position "A". But at the same time, as, said JKP, the design will be very difficult, since it will take 2 to 3 more rockers  (reciprocating-lever). And I again do not see any advantages.