They're definitely not the Mark 4's. I use a pair of those and they have a single large hex nut on the side to clamp the the ring base onto the rail. I'd honestly prefer the pair of torx bolts over that system.
Any new info on these? @beretta_man11 how do you like them? Any loosening issues? The design of them looks extremely similar to the Seekins rings to me, especially the way they connect to the rail, but even how the top split clamps down. Looks like basically a Seekins ring with less material in the areas where Seekins are thick. Which is great for me because I love the Seekins design, nice and sleek, nothing sticks out to get hung up. They're so similar in my mind I actually wonder if Seekins is designing and building these for Vortex like they do the high end ones? Anyways, if anyone can confirm they don't loosen over time or have any other issues I'd love to hear about it. Thanks.