A friend installed a Holosun 509T on his competition Glock. There was more distortion in the lens than I was expecting
However, zeroing it at 30yards made a plate rack a breeze. Could put rounds whenever I wanted on the plates, left, right, or center. Also we were shooting a 50% IPSC at 100yds no problem

I need to get a 17 MOS or something and look into an Micro red dot of some type for it. The list goes on