I ordered Fiber Optic front sight's for my 75b and P-09 from the CZ Custom Shop and had them gunsmith installed. Both pistols now shoot consistently low. They look the same height as the original sight's but I'm definitely hitting low with both gun's. Switch back to the original's? I'm shooting a 97b with the same set up, so I'm pretty sure it's not me. Thank you. I am using the same ammunition, 115 grain FMJ.