The changes were mostly, but not entirely, cosmetic. The profile of the BOTTOM of the grip...and thus the mag floor plate, the location of the "Sig Sauer" script on the side of the grip, a change from ribbing to stippling on the FRONT and BACK of the grip.....and thickening the polymer material of which the frame is made - in a few key areas. That's it, as far as I know.
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