Actually, your 308 bolt face is .473" and the 7.62x39 bolt face is .447". The 7.62x39 will fire on the 308 bolt face, and may eject, but it is best to get the proper bolt face. I have done a 6.5 Grendle conversion which uses the same bolt head as the 7.62x39. You can get one from GunShack. :-)
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