Update: I obtained the required parts that I suspected were failing from several different sources listed above. It was sort of hit and miss as to who had what in stock. Now, the pretty little Browning is shooting pretty little half inch groups. One failure out of 100 rounds of various 22 ammo at speeds from sub-sonic to high velocity. Only remaining problem is that it is shooting about 3" high with the rear sight in the lowest position. Now on the hunt for a taller front dove tail sight. I love this gun!

__________________
Some collect art; I shoot it!