The 39D carbine is a pistol grip with no checkering. Very Limited production of about 2200+ units from 1972-1974ish as I recall. Micro grooved barrel, and mine is hyper accurate out to 100 yards.
This one's being offered at a rightous price for something not seen for sale very often.
Remember Aesops Fables of the "Scorpion & and the Frog's" crossing the river...
... we must hang together, or we will ALL hang seperately, Ben Franklin..
Those who fail to learn from History are doomed to repeat it,Santayana