phoglund
Member
I used the aforementioned 4 lb. sledge. Worked after only a few good wallops. Yes, there was still cosmo in there. Yes, I had cleaned the snot out of it before I finally removed the firing pin. Do it, clean it, be happy.
Actually, the M59/66 may have phosphor OR tritium sights, sometimes both on the same rifle due to rebuilds. Earlier models had phosphor, they switched to tritium in 1986.The sights are tritium