So I put a Fastfire 3 on a Ruger 1911 with the same sight cut as the 6700. I used the Burris mount designed for the Novak cut and with a little polishing on the bottom of the base it fit well and stood up just fine to more than a little shooting. Not the ideal solution, but it worked well enough. If you find the dot works for you, then maybe get the slide cut. Lower is much more better.
I'm fairly certain the sight cut on the "Target" model is called a "Kimber" cut and is kind of a modified Bomar cut , but definitely far from sure enough to be ordering parts.
I'd probably steer clear of that thing your looking at as well.