JokerFace Airsoft takes a look at the The xFORCE XFR01 with flexible mounting that he got from Begadi. The German airsoft supplier has this description of the product... " xFORCE XFR01 Reddot with with flexible mounting. Tis a very good and inexpensive red dot sight with a point reticle.
The slanted lens prevents reflections from e.g. Sun exposure or other light sources.