On an 03A3 , the ring is supposed to be against the reciever. On an aside , however , be sure it's a 1903A3 ring and not a M1917 ring. The A3 ring would be marked "R" or "RP" on a Remington and blank on a S/C. The 1917 rings could be marked "R" -Remington again , E- Eddystone, or W-Winhester.
Chris
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