Is the slingshot inner bow door 30 cm small?

30 cm inside the slingshot is a little small, usually 40 cm.

Different cities have different distances from the target. The larger the arch, the smaller the distance between the upper arch eye and the target, and the smaller the arch, the greater the distance between the upper arch eye and the target. Therefore, the big bow door is superior to the small bow door in horizontal gun aiming.

Slingshot is not a weapon or appliance, its only value is entertainment.