So yesterday the armory i work at receive 4 broken Polish AKM with pretty burned out bolt and a basically rifle-free barrel (they were training rifle so they been fires for literally 50 years now). My commanding officer said those guns was free game and i can do whatever i want with them in the shop. I don't know if i should rechamber them or just replace it with a new AKM bolt and barrel. Got some AK74 bolt/barrel and Galil bolt/M16 barrel laying around. What should i do ?