Thread:⑨Cirno⑨/@comment-4115653-20130918153228/@comment-11356046-20130918164106

M39 is derived from the M14. The US Marines needed a designated marksman's rifle and they used the venerable and accurate M14 as a base for their M39 EMR design

The M39 was then replaced by the Marines in favor of the M110 SASS (their version fo the Mk11, aka SR-25 semi auto sniper rifle)