ID GO THAT ROUTE BEFOR WELDING ON A BOLT.The M76 bolt and bolt carrier can be bought for $150. I'm sure there are PSL owners that would buy the spare 7.62x54R bolt
THERE ARE A LOT OF WAYS TO LEGENTEN A BOLT YOU CAN ADD AN EXTENSION TO A SMALL STEM BOLT THAT SLIDES OVER THE EXISTING STEM AND THEN MAKE THE OFD FIT A LSRGE STEM CARRIER THEN WHILE YOU ARE AT IT ADD A SPPRING LOADED FIRING PIN AS IF YOUR GOING TO SHOOT TRUE 308 THEN YOU SHOULD HAVE ONE AN IF YOUR GOING TO HAND LOADF ITS GOOD IDEA AS WELL SO YOU CAN USE STANDARD PRIMERS. SLAM FIRES SUCK ON SOFT PRIMERS. AN YES IT DOES HAPPEN i KNOW FOR A FACT.