Octagon barrels are usually not sought after as shooters but garner a stronger following by collectors. Of the chamber mentioned the 221 Fireball is probably the most novel, then the .22 WMR and the other three are relatively common. Condition is everything when premiums are expected.
All and all barrels might average $175 each, frame and furniture will go for $300. If it's a square grip with metal plate grip cap it'll bring a higher value.
Hope I've been helpful.
Last edited by gemihur; 07/25/16. Reason: punctuation
