Well, the pic you posted is an M712 lower, with the selective-fire switch above the grip the ANH DL-44 doesn't have. So the blaster lower frame might have had a similar hole drilled in it, but it's not that actual piece. Not sure you were saying that, but wanted to clarify...Soo... are we saying that the mount was (maybe) made for the "Sitting Target" where it was matched up with the Hendsoldt? Are we ready to consider the dot in the middle of the mystery disk is the hole they drilled on the left side for a "Sitting Target" type mount before it was moved to the right?