Posted by Tom Archer on January 26, 2017, 11:07 am, in reply to "other pictures"
"For those that do not know, the picture of the stock showing the two rectangular slots are where the stock was attached to the duplicator."
And to add to David's comment, having these rectangular duplicator machine slots, or "dimples" present on the butt end of a Smith stock is the only way to know for sure a Smith stock has not been shortened.