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yes
Yes, there is an owners manual available for a Charles Daly Model 500 double barrel shotgun. Various sources can be found online.
yes
Cabella's
I believe only Charles Daly offers barrels for its guns. I haven't found them anywhere else. You will find an 18 inch, 12 ga. slug barrel at: http://www.charlesdaly.com/HTML/products/accessories/accessories.asp
Charles Daly firearms was created in 1875.
hard to tell without seeing it but if it's a flintlock,in very good condition,$250-$280 seems reasonable.The one I'm thinkig of has a 29" bbl,50 cal.
You "can" so to say , but if the barrel is not rifled then you will end up damaging it after a little while.
John Charles Daly was born on 1914-02-20.
John Charles Daly died on 1991-02-24.
Charles P. Daly was born on 1816-10-13.
midwayusa.com, search under Charles Daly