If you really want to know what you have sign up on the CMP forum and ask away, these are the people who know M1 carbines in and out. Removing a serial number does not sound right to me.
https://b34da70920f9-006155.vbulletin.net/forum/cmp-sales/m1-carbine?f=6
Definitely an Universal op rod, later generation. Needless to say the rest should be universal also. It should say Universal, Hialeah, FL on it. Universals, especially non Gen1 like this, are at the bottom of the M1 carbine totem pole, most true carbine people do not own one. Value, if all...