Side view of the foresight fitted to a Feinwerkbau LG700
As can be seen this foresight (made by Centra) has three separate adjustments, one for cant, one for diameter of the foresight element and one for the thickness of the foresight element ring. It is quite common to find guns made by one manufacturer equipped with sights made by another. The sight is used by looking through it from left to right, see: View through the sights of a Feinwerkbau LG700, for more detail and explanation.