Bojangles. Its a one piece armalite mount. Clears the 50mm just barely. And the prs stock works good.. can raise or lower cheek piece.
That was my guess. I have exactly the same combination, NEA adapter. PRS Stock and the Armalite mount. I have not yet put it together. My only concern is the height of the rings. This set up is a bit lower than factory. The longer LOP would be a bonus for me.
Thanks for the post!
B