The meaning behind this one might be a little too subtle. The one red bullet is to represent “Did I fire six shots or only five?”
I used two images for this, so here’s the attributions:
English: Smith & Wesson .44 Magnum Model 629 with 8 3/8″ barrel — a stainless steel version of the Model 29. Photo © by Motorrad67
2007-09-07 (first version); 2007-10-02 (last version)
Originally from en.wikipedia; description page is/was here.
Original uploader was Motorrad-67 at en.wikipedia Later versions were uploaded by Liftarn at en.wikipedia.
(Reusing this file)
Title: Steyr and cartridges
Attribution – Noncommercial – Some rights reserved