Looks fine to me - aside from the afore-mentioned rear sight.

I cannot read the serial, but it looks like 7020X - ??. I own 70210, which went to China with the 6th Cav, on the famous relief expedition during the Boxer Rebellion in 1900. I have the numbers of about 65 other carbines with same attribution - apparently yours is not on it since you would have found it if you checked with SRS.