I have not seen the military ones. On the early RD models, that part Frank referenced is the only carry handle I have seen. It is one solid piece as in the diagram. I have seen one side and both sides broken off, but they are not replaceable. The entire solid part would need to be changed out.
Can you get us a picture of the recess you're talking about?
"darkness has a hunger that's insatiable, and lightness has a call that's hard to hear"