I just read about the C-More sight on the FN web site. They will be offered as fixed, low mount, three dot sight. You will be able to get them in white dot and tritium. It looks like they will be available as an aftermarket upgrade and you will be able to order the USG model with them already installed. The web site did not give a price or picture.
I'm in the same boat with you . I've got some experience with this topic . I've got a Doctor red dot sight on my back-up gun , a S & W 659 which mounts where the rear sight goes . The sight is really compact but is easy to acquire targets . Keep both eyes open and the red dot is where the hole goes . It automatically ajusts for lighting conditions . I got the 3 mm dot instead of the 7 mm , which is also available , for more precision . The only problem is getting a mount to fit the 5.7 sight . I hope to talk to Trijicon who makes it to see what mount they recommend . I also want you to know that the sight has incredible battery life . It comes with a cover which turns it off , which I promtly lost 1 YEAR AGO and it's still on and bright .... been on 24/7 . I use this with a Cobra can and it's great . Hope that helps . Good Luck . B-Man