Remington or Springfield?

[conard]

Hello RSA ......

I was given this gun for a bonus for a large cabinet job. The owner has a huge plains indian collection. He bought this gun along with the artifacts from a member of the family, there grandfather was a scout for the US Army on the frontier. Anyhow, is it a Remington or a Springfield Rolling-block? Overall length is 36” ...... barrel length 20-1/2” .... I don’t know the caliber .... stamped ‘US’ on the the butt stock and the forearm ...... ‘B’ stamped on left side on barrel .. SN on top of barrel ‘239’ ......... ‘U’ stamp on barrel ring ......... ‘P' stamp on bottom of barrel ..... 'F' stamp on butt stock next to tang .... ‘CSA’ stamped on top and bottom of butt stock ... tang marked E. REMINGTON & SONS. ILON, NY U.S.A. PAT. MAY 3RD 1864 MAY ?? JUNE 11TH DEC NOV 12TH DEC 24TH 1872 DEC ???? 1873 JAN 12TH MARCH 16TH 1874. What does CSA stand for, what does it all mean? Help! I have been trying to find out about this carbine for quite a while, I can’t find any pictures or any real information.
Four digit numbers stamped on the top and bottom tangs 4131

Thanks

[ehull]

Hello- Your carbine appears to be a standard Remington manufactured gun. The last patent date of 1874 obviously places manufacture after that date. The Springfield Armory made no such carbines after 1871. The only other US military use was for the National Guard of NY (caliber .50) but the last delivery there was also before the March, 1874 date--and the NGSNY carbines had a very distinctive high hammer (which your carbine does not have). The "US" and "CSA" markings appear to have been added spuriously and are not original to the carbine. The number stamped on the top of the barrel is also not an original Remington or US marking, but some other military (or civilian) user probably added it for their own reason.
Note that the buttstock and forestock are fitted to the frame with a "rabbit" or overlapping edge on the frame; this feature was made after 1879. The carbine also has a rotary extractor, also a post 1879 feature.
The number stamped on the tangs is the factory "serial number" for tracking purposes.