UPDATE/UPDATE-
One of the two collars had a bit of roughness of material at the 90 degree off set notched area, that adapts the collar to the "tool" area of the grip frame. It was only .00150" and just enough to cause the issue. Two "whiff" passes with my triple fine flat file and presto! No more problem! Easily done, as the collars are made of a similar material to the frame itself. Glad they're here!