Mounted on my CZ p-09 nocturne C using the short screws supplied by Freedom Gorillas. I stumbled on their Youtube videos and Im so glad I did. Loved their review on all the K pattern Holosuns that fit on the Nocturne C. I have several 507K sites and at least 6 more Holosuns for different handguns and AR platform rifles and none of them have ever failed in the last 5years with thousands of rounds used. The SCS carry is awesome, so glad I gave this site a try , Very easy to operate and zero in. I did read a review where a guy stated that if you're using the dot and circle together the circle is not straight. the lines at 12 o'clock and 6 o'clock are not vertical and the 9:00 - 3:00 o'clock are not perfectly horizontal. The whole circle is slightly turned clockwise by a little bit. Well mine is also that way. I won't loose any sleep over that since I mostly run dot only.... Thank you guys at freedom Gorilla you can't find a better price or faster delivery anywhere and the discount code was a plus as well. F.G. has earned my biz!