A Scottish gunmaker in the late 1800’s Alex Henry styled the groove if I remember. May of been a possible sling or f nothing more than ornamental. Bill Ruger loved the lines so he included it. I’m on my way to look at JD’s book
I think it was intended as a bear bottle opener.The real question is: What is the purpose of the groove in the forend?
I have a theory, but I'd like to hear your thoughts.
I theorize that it was intended to suspend the rifle using parachord from the doorway of a Huey. ;-)