I got what seemed like a real good deal at the time on a Marlin model 75(A shorter, cheaper model 60) that was sold under the glenfield name so it is at least 25+years old.(btw its an semi auto)
Anyway, the gun will fire fine when you rack the first round in, but after that there will be many rounds that won't fire. The gun still clicks, just the round doesn't go off. After a misfire I will rack a new round in and eject the misfire out and it will fire fine.
I am using cheap ammo. The misfires fire fine a 2nd time through. Do I just need better ammo? Or is the firing pin or a spring going out?