The serial number is a little "low" to give it a certain chance it was one of those sent to Springfield as a "bare" receiver. Supposedly, that started at roughly 375,000 or so. Is the etched serial number on the bolt handle (late four digits) or on the bolt body (entire serial number). If the former, it may be a Greek return; if the latter, possible (depending on other features being present) a USMC rifle. Did you look on all sides of the safety lug (located about halfway up the bolt body)?
The ICC/RIA is a rebuild/inspection stamp from Rock Island from the 1920s. The "WGS" may be a WJS, which is a Springfield inspection stamp dating from about 1918-1921.
"We make men without chests and expect from them virtue and enterprise. We laugh at honor and are shocked to find traitors in our midst."
--C.S. Lewis