I'm not Mr Room-Broom but Id look at these models; Mossberg 500/590, the Browning BPS line, the Remington 870 or 1100 series, the new Remington 887 12ga, the Beretta line.
See:
www.gunsamerica.com www.remington.com www.gilbertsguns.com www.natchezss.com www.midwayusa.com www.cabelas.com www.midwayusa.com .