Thanks
@CSTactical. I ended up picking one up off a friend that ordered multiple. No one seemed to be sure on the specs though and which accessories will fit from the 624. These specs came directly from Kahles. This helped me to understand the major differences.
@arm017 I love my 624 Gen 3 too. I won't be getting rid of that one. Love the SKMR3 reticle. I just got rid of my Gen2 624 because I wanted to have my reticles matching on both of my rifles. I honestly like the Gen2 parallax knurled knob better though.