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I might be wrong but Barry at Bits of Pieces in BC, used to do barrel extending for them. I remember seeing something about this in the milsurp forum but cant find it right now, try doing a search there too.
I have a non restricted M1, the reciever is IBM, so an original...barrel has no markings so is aftermarket made, and Bits of Pieces is the one to contact, i had already talked to him about a new barrel or sleeve for my Bavarian M1