I have rarely seen a Browning ST-100 (not to be confused with a BT-100) for sale. Jaquas in Ohio has not one but, TWO for sale! Wish I had the money, I would own one of them!
My belief was it was probably ahead of it's time. There were only a slight handful of adjustable impact guns then and it was the only one on the conventional American market. Most people just couldn't wrap their mind around that concept back then. Remember this was a time when Model 12s, 870s, 1100s ruled . If you saw anybody shooting an O/U it was usually a conventional Browning and the few Perazzis on the trap field were being imported by Ithaca! I firmly believe if it had been produced 15 to 20 years latter it would have been a success!