You would first need to locate a 7.62 barrel,say $300.Then locate someone with tooling to do the job and pay his shop time and a slice of his tooling investment.If the barrel indexes correctly as it is,it is then just a matter of finish reaming the chamber with a pull through reamer in order to set up the headspace.Things get a bit more complicated (and expensive) if the barrel does'nt index properly as it is.Correction would involve facing off the barrel shoulder on a lathe in the case of under-indexing or peening or roll swaging the barrel in the case of over-indexing. I like Garands in both .30-06 and 7.62,and prefer them to the Norinco M14 clones.If you want bargain priced 7.62 shooting in a military semi-auto,you might better pursue this option.The so-called "tanker" garands are a marketting myth which was never adopted by the military.