Since acquiring my CZ P-07 Urban Grey and putting it in my concealed carry rotation, I've been contemplating sending the slide off to get milled for a red dot optic sight with backup iron sights. I couldn't decide on which optic to use, or which iron sight set to use, or where to send it to have it milled (decisions, decisions). After several sleepless nights trying to decide, I ended up buying a complete Gen1 P-07 Duty upper from CZ Custom that was already milled with their multi-optic cut. I also added their 10mm height tritium front sight with the hope that I would be able to co-witness the front sight with the line on the back of the Burris Fasfire III optic to work similarly to XS Big Dot sights if the dot ever fails for whatever reason. I'll be using the Urban Grey as a USPSA Carry Optics division competition gun as well as an occasional concealed carry gun.
I have a P-09 that I mounted a Burris FF3 on with a Springer Precision dovetail mount with the intent to use in Carry Optics, but I found it a bit cumbersome to find the dot when drawing from a holster in dry-fire practice, and it was even worse when transitioning to strong-hand only or weak-hand only. I find it MUCH easier to find the dot on this milled slide with the optic mounted lower and I can use the front sight as an alignment reference point.
CZ-USA CZ P-07 Urban Grey with a Burris Fastfire 3
Co-witness front sight through the optic
Co-witness with the red dot turned on
XS Big Dot sights for reference
I took it to the range to see where the point of impact is using only the front sight lined up with the back of the FF3, and it is very usable even out to 15 yards. Below is the very first shot with co-witnessed front sight (red dot turned off) at 10 yards. The second photo shows several shots at 15 yards with only the front sight mixed in with several shots with the red dot turned on.