I have an M14 Norinco receiver (forged) with what I think is the original Chinese barrel and op-rod. Who in the Portland area could do the USGI bolt conversion on this? including the USGI bolt. and from I understand, it requires barrel replacement since the Chinese barrels won't headspace with USGI bolts. I'm not sure about that. The bolt conversion is desirable because apparently a lot of the Chinese bolts were crap - soft steel.