Pinned barrel does NOT eliminate the possibility of overtightening. The cracking problem existed long before the pin was eliminated. The consensus seems to be that a cracked frame under the barrel has nothing to do with +P, everything to do with initial manufacture, and S&W seems to be pretty liberal about taking care of those occasional errors. I'd try the seller first, but there is certainly a chance that S&W might take care of it, even for him.
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