Hard to install on a design machine ps90 mount - Trijicon 1x25 MRO 2.0 MOA Adj Red Dot Sight with Optional Mount

It is an amazing little optic It was very difficult to mount on a design machine PS90 mount, Through no fault of trijicon it is because the upper on the PS90 was cast and there are imperfections I had to stone both sides of the moint and then smack it with a plastic hammer without hitting the MRO. Quite the task.i am going to contact trijicon about the Starburst and no crisp 2.o moa dot.