So, I installed a Burris Fastfire 3 on my Walther Q5 match and I'd like to order a Dawson Precision taller fiber optic front sight so that the dot sits above the white line on the rear of the Burris. I just fired off an email to Dawson with the same question but I figured I'd check here too. According to my measurements the top of the slide to the top of the white line on the rear "deck" is .365" if that helps.