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SC 1903A3 Rebuild Barrel Markings O.B.S.3
I have searched a bit and found no like rebuild codes I found while cleaning my new acquisition SC 1903A serial #3622813. I place this receiver in Jan 1943 with with a barrel date of 3-43 so the barrel and receiver seem likely original to me. Thinking the three month window was relevent? Anyway, the barrel under the hand guard reads RBLT O.B.S.3 1.3.1945. I can't seem to find O.B.S.3 in any of the arsenal code charts I can find online. Also seems odd an A3 would be rebuilt only two years after being built and likely retain the original barrel and from what I can tell the original stock as it's a SC stock. Any help identifying O.B.S.3? Probably simple and I am just missing it.
Thanks