Works great with a Vortex Viper. Wish it used the factory cap screws as opposed to new flat head type. That being said it works as advertised and cleans up the gun nicely. It can mount in 3 locations one requires removal or rear sight.

This is a great mounting option for a red dot to get it lower to the bore. I was simple to install and provides May mounting options and configurations. Glad I made the purchase.

Excellent mount, thoughtfully designed and very well made. My only concern with the mount is the taper on the end of the screws that attach the mount to the pistol. The screw holes on the pistol are only 4 threads deep and you lose a little over 2 threads due to the taper on the screws so there are actually less than 2 threads holding the mount to the pistol. I would prefer to see the end of the screw threads flat rather than tapered to increase the amount of thread contact. The original screws used to mount the factory rail to the pistol are slightly too long to use with the Shadow mount or else that would have been a simple solution. Great mount though and overall I am very pleased with the design.

I like the low profile look this gives my Mk3. My Vortex sight mounted up easily. The package contained many extra screws, rubber spacers etc I assume for it to work with a variety of red dots. The parts feel and look like quality, just like every TandemKross item I have purchased. Outstanding quality for a fair price. Would buy this again and recommend to others.

This mount fit perfect, Had all the holes for versatility in the right places,and mounted very easily.Very stable for larger optics.

Quality construction great fit and easy installation.i installed a venom red dot on a Ruger mark IV perfect fit

While this is a great solution for mounting various red dots to Mark series pistols, I ran into some issues with the provided T10 torx screws. One of the T10 torx screws tore out the 6-48 threads in one of the holes in my pistol's upper. I made sure the threads were cleaned/degreased prior to inserting the screw & torquing and used a torque driver set to only 10 in-lb as recommended by TK customer service. I did not attempt to torque the other screw out of fear of stripping out another hole in my pistol. Fortunately TK customer service stepped up and offered to repair the hole with a 6-32 thread insert free of charge, which I took them up on and am greatly appreciative of. That said, I now have different thread pitches on my Ruger pistol because of this. It sounds like I ran into an isolated problem, but I highly recommend using the Ruger OEM screws to attach the Shadow mount to your pistol's upper if possible to be safe. I certainly don't trust the T10 screws that came with my mount. TK's willingness to repair the damaged threads on my pistol (and actually completing the work in a very timely manner) says a lot about their company and quality of service. Every other TK product I've purchased & received so far has been great. Had the provided T10 screws not damaged my pistol, I easily would have rated this product 5 stars. I cannot excuse the fact that the provided hardware damaged my pistol, however, and the rating I gave reflects this.

This mount fits perfectly with my C-More and gets the dot down as low as possible. Very pleased with it.

Added this mount and a Venom Viper to my Mark IV, nice solid mount.