I just purchased what appears to be a full military U.S. marked Ross MkII 3*. It was filthy and a little rusty, so I took it apart to clean it up and noticed that there were two non-threaded holes about 1/8" deep on a 3-inch center below the rear sight. I've read that barrels were sometimes set back on these, but this doesn't seem to be the case. The barrel is 28-inches long from muzzle to bolt face. The spacing on the holes also seems long for any sights I've seen. Can anyone comment on what's going on here, and should the piece be safe to fire? Bore and chamber look perfect. Thanks.

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