The Russian tried making 308 AK's with AK-74 type bolts and they failed to pass the CIP proof testing in Europe. CIP proof is 125 percent of the standard pressure limit. The Russians then changed the bolt design to the three lug bolt. The 308 Valmet and the Yugoslavian 308 AK both use longer and heavier bolts but they were both designed before the CIP proof testing was required for sales in Europe. Then there is the 8 mm M76 and now a 308 PSL. I have heard of the 308 Galil receivers cracking.