Eugene Morrison Stoner was born in Gosport, Indiana, to Lloyd Lester Stoner and Billie Morrison Stoner. This small town environment likely fostered a practical, hands-on approach to problem-solving that would later characterize his design work.

Stoner spent his early years in Indiana before moving to Southern California. This relocation exposed him to a different culture and environment, possibly broadening his perspective and interests.

Although details are scarce, Eugene Stoner worked as an ordnance specialist in the U.S. Marine Corps Aviation during World War II. This experience exposed him to military firearms and equipment, sparking an interest that would shape his career.

Following his military service, Stoner pursued his interests in engineering and design, though specific details of his formal education are not widely documented. He began gaining practical experience in various mechanical fields.