Not "ALL" of them. I have a vent rib B grade that letters as a factory vent rib. It has one letter stamped under the rib where the last three digits of the serial number normally are stamped. That letter appears to be an S. I have tried my best to convince myself that it is a 5 which would correspond to the grade but it does not appear to be such. The gun is right as rain and there is no question about it being factory original and correct.
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