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I still have 2 of the ATN X-Sight II HD scopes. Totally happy with my purchases and they have held up well. I do used the IR850 to brighten up the view at distance when it's really dark and would make this an essential accessory. The lower cost of the ATN digital scopes, vs thermal, makes entry into night vision very affordable. ATN customer support, lately Faris O., has been really helpful and responsive in helping me out when lose a part or need such help, so I have no problem providing my positive experience with their products and support.
The first DD-7101-S mount I bought was a low profile, 2 piece mount using a hex head screw, as shown in the picture here on OP.
The version shipped now is a one piece mount that is secured using a slotted screw.
# 03-021-10214 is printed on the part, in a box labeled # 03-021-30029, as viewed on DDs website except that the shipped version has the screw inserted from the top, not the bottom as on DD's website picture.
The new one also has a higher profile than the older 2pc version.
The new design can be viewed on Daniel Defense's website
The new design has a higher profile than the previous design.
I liked the 2 piece low profile version better than the new one piece design.