Quote:
Originally Posted by Wayne M
S&W supposedly stamped the F on the cylinder when they stopped counterboring the cylinder(recessed case heads). Why they chose "F" is anybodies guess. "F"ull length cylinder, "F"inally a smart move, "F"unny this took so long to figure out.....who knows? Someone, somewhere does I'm sure.
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You may have a good point. Maybe it means "F"lat to distinguish them as an un-counterbored variant for a model which formerly had a counterbore. They are, after all, interchangeable.