I'm trying to identify a Marlin 22 lever gun for a friend. It's old. Looks like a M39 with an octagon barrel. Not factory drilled on receiver. No model number on gun. Top of receiver says "Marlin Safety". Takes down like a M39, but no slot in takedown screw. Mag tube works well- pull on latch, tube slides forward. Drop rounds into port in tube. Slide tube back til it clicks. Serial # is 117xxx. General condition of gun is fair.