I’m thinking of buying a skinner peep sight to replace the factory rear sight on the old 336. I don’t know if I can bring myself to install a fiber optic on that old gun lol.
66LA Receiver Peep Sight (Fits Marlin 336 & 1894)
66LA Receiver "Peep" Sight (Fits Marlin 336 & 1894) by LYMAN The 66 sight is designed for mounting on flat receivers, such as lever action rifles, like the Winchester 94, Marlin 336 or modern shotguns, there's even a model for the SKS. Features include 1/4 minute audible click micrometer...
www.midsouthshooterssupply.com
Lyman #2 Tang Peep Sight Marlin 30, 336, 1895, 1894 Steel Blue
In 1995, Lyman introduced a new version of the No. 2 Tang for Marlin Models 336, 1894, 1895 and 30 series lever action rifles. The Marlin version...
www.midwayusa.com