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most likely it is. marlin (glenfield is marlin) began using micro-grove technology in 1953.
My Glenfield Model 25 has a micro-groove barrel,so I imagine others do as well.
Seems to be a descrepency here. There were no model 36 marlins made with Microgoove barrels. The model 336 was made with a Microgroove barrel, and if that's what you have then your's was made in 1972.
your marlin/glenfield was made in 1974.
value marlin glenfield model 60 22 simi auto rifle
write to marlin with any and all writngs/markings on reciever/barrel and serial numbers
Marlin Glenfield. http://www.marlinfirearms.com/About/History.aspx Marlin Glenfield http://www.marlinfirearms.com/About/History.aspx
On my model 20 its on the left side of the barrel directly up from the clip.
1965
$200
Your Glenfield model 60 was produced in 1989.
your glenfield was made in 1968.