In my over a half century of being in this game I have seen a lot of guns come and go. Some of these had a brief History . Some of them were really good guns ,others only fair . First off the Mossberg 500 Trap model ,and YES Virginia , I'm not pulling your leg, it DID exist ! It was labeled as the AHT model. It was fitted with a high comb and a raised Simmons rib. I shot one a time or two and it handled pretty well .It's only draw back was it's trigger which left a lot to be desired. -- Next was a gun that was well ahead of it's time for the early 1980s, the ST-100. It was manufactured for Browning in Belgium. It was an O/U that had an adjustment for POI and had figure 8 style barrel support collars. The gun was not cheap for those days , ( which is probably why it's production was short lived) but, it was way ahead of it's time in design and was a really well made gun.---- Another Browning model that never caught on was the Browning 2000 semi automatic. It was a gas operated gun with a loading port on the left side of the receiver. It pointed well but ,just never caught up in sales with the 1100 ,and at that time Winchester was producing the Super X-1 and both were less expensive . The model 2000 was a hoot to watch during late evening shoot offs. If you looked quick you could see fire from THREE holes , One from the barrel, one from the ejection port , and one from the loading gate ! -------Savage had two O/U Trap Guns that were produced for a short time ,the 330 and the 333. These guns were made for savage by Valmet and used that design. They were short lived but actually pretty good shotguns. The 330 did not have ejectors but the 333 did.------Another gun that was around for a short time was the Beretta TR-1. It was a plain and simple S/B Trap gun that used a lever attachment in front of the trigger guard to open the gun. It wasn't fancy and it was probably Beretta's attempt to compete with the BT-99 in the American market. As with all Beretta products it was really a well made gun. ----Another candidate was the Ithaca model 51 semi auto. I owned one. It balanced well and I shot some REALLY GOOD scores with it. It had a good start and an excellent warranty but ,it had one bad issue that probably killed it. It broke action bars like nobody's business! Under their warranty program Ithaca would only mail you one at a time and you had to send them the broken bar first and you had to take it to an authorized Ithaca repair station . After 3 times I gave up and traded the gun. --Then there was the Ljutic "Space Gun" this gun looked more like a weed eater or pogo stick that a shotgun ! It was straight as a 2x4 , had a raised rib that was fitted on the forward end of the barrel and a "button" that fired it instead of the conventional trigger ,and they WEREN'T CHEAP ! You saw them for a while in the 80s but they quickly faded from the trap Line and today those that have them, keep them as more of a conversation piece. Remington's Model 58 ( their first gas operated semi auto ) only lasted 7 years. ( 1956-1963) . It was known to have some problems with cracked receivers. It was discontinued when Remington brought out the 1100. My last entry is the Remington 870 "All American" produced first in 1972 . I am told they only produced 1,000 of them but, not sure if that is correct and I haven't found the exact numbers on line. I liked the gun but, some have said they "overdid" the scroll work and some have mocked it as "The tattooed Lady " At any rate it is solid, like any other 870. There are more "short" time Trap guns but that's all off the top of my had . Maybe somebody has more in mind .