Try e-gunparts.com
It's a shotgun, not a rifle. Value for the single-barrel 'Newport' guns in .410 run about $75-$100. sales@countrygunsmith.net
@ 1900 to 1930
you can find them in the numrich catalog or there web site e-GunParts.com
The patent for Newport Model CN double barrell shotgun is 1915, but Newport was a named given to guns made by J Stevens, Ivers Johnson, and Crescent Arms. So most likely it was made in the early to mid 1900's.
Go to the App Store on Mac and search 'Shotgun FunFun'. You will find a game called Shotgun FunFun. Download and install it.
The Norinco reproduction of the Winchester 97 pump shotgun was designed by reverse engineering (aka copying) an original Winchester 97. Therefore drawings, schematics and instructions for the original should work for the reproduction. These are routinely available on eBay. At the time of this answer, 360004560026 was one such item.
1915 c n Newport 12 gauge coach gun
I got one from e-gunparts.com, which is Numrich. They have schematics for many guns.
Numrich has a gun parts website. Best bet for any gun parts or schematics...
Newport was a brand name used by Hibbard, Spencer, Bartlett & Co, Chicago (1882-1962) on shotguns made by Crescent Arms Co, J. Stevens Arms, Crescent-Davis, and probably other manufacturers.
www.jackfirstgun.com (605)343-9544 pH for a catalog of schematics etc. Larry Stafford,gunsmith Phoenix,Arizona (602)339-9088 shop