Numrich gun parts corp.They may be found on the web.
behind the rear sight bracked on the left side just above the stock
gunpartscorp.com You can also search for Marlin model 80 parts seeing as how the J.C. Higgins is a clone of the model 80 and Marlin is easier to get parts for. I got a model 80 elevation key for the rear sight from the sight and looked and fit exactly the same as the old one I lost off my J.C.
the value of marlin model 336rc 30 30
Left side under the rear site. That's where it is on my 99M1.
you do for a marlin or mossberg
Peep sight
Savage 325c rear peep?
Tap it gently. that's all it takes! This is from the manual: Your rifle has been sighted-in and test-fired at the factory. Due to individual shooting characteristics, however, sighting should be range verified. 1.) Vertical Correction (Elevation) To raise the point of impact, raise the rear sight, by moving the sight elevator rearward. To lower the point of impact, lower the rear sight, by moving the sight elevator forward. The sight can be raised and lowered by moving the stepped elevator forward and back with your thumb. To move the point of impact to the left, tap the rear sight base to the left. To move the point of impact to the right, tap the rear sight base to the right. Windage adjustments to the rear sight can be made by gently tapping the dovetail portion of the rear sight in the desired direction.
http://www.e-gunparts.com/products.asp?chrMasterModel=089Zz22-410&MC=
Your rifle is a Marlin Model 80. They were made from 1934 up thru 1969. No serial number indicates made before 1968. Early rifles had open sights, later had a rear peep sight.
S&W, e-gunparts.com, Brownell's
Sometimes it on the top of the barrel near the rear sight. Sometimes it's on the side of the barrel.