Just got payment from a guy in the form of scope rings and he sent a set of 30mm Night Force rings and then the ones below and I can't figure out what kind of rings they are. Any help would be great. They aren't Mark 4's because the mark 4's have a circle on the top of the ring and these do not so I am out of guesses. Thanks! They have the number 9644 stamped on them too if that helps.