181: NIB Rock Island Armory Model SR-104 Single Shot Shotgun in 410 Gauge with 20" Barrel. This break open single shot shotgun features a 3" chamber, a 20" contoured vented ribbed, chrome-lined barrel, bead front sight, polymer forearm and stock w/extra LOP buttpad spacers, silver receiver and a black parkerized finish. The gun is brand new and in its original box. Great beginner gun. Estimated Value: Low: $150 High $200