Blue Book of Gun Values
Brownell's
South Persia Rifles.
Do a google search on continential rifles or multi barrel rifle systems.
it think you will find the long gun of the calvary at the little big horn were carbines, not rifles...
Owners manual, Gunshop, most rifles have the caliber listed right on the barrel
You need to find a gunsmith.
Try the auction sites.
You will have to contact the maker to find out.
Dockendorff made sights.
Winchester 1892 rifles were made from 1892-1945. To find the age, look on the metal plate, just behind the cock.
where to find price on a interarms 243 markx
have you ran into www.littlegun.com I have on and you can find me at tsmith@paramit.com