I need to know....expensive trap guns =semis or =over unders?
Like bozwell said, mostly break action guns.
Some common names, and some names you may not be familiar with.
Beretta
Perazzi
Krieghoff
Browning
Kolar
Alfermann
Ljutic
Zoli
To name a few.
Actually, a lot of guys start with semi-autos, then upgrade to break action guns. Remington 1100, Beretta 391, and Winchester Super X-1 are common semi's, though since they don't make the SX-1 any more, they are seen less frequently.