Buzz.mn, the online Strib feature run by James Lileks, has a once-a-week four-panel comic strip from the Strib's ancient files (1940s, it looks like). Each week, Lance solves a crime in the last frame based on evidence revealed in the first two frames.
I only mention it here because it often involves basic gun knowledge, although the grasp is shaky at times. A very recent one (found at http://www.buzz.mn/?q=node/3913) has Lance solving the case by finding the murderer's prints on a cartridge case in a revolver she had wiped down, foolishly thinking that that would remove all evidence.
But often, as in this one, the gun knowledge is just goofy. The cartoonist shows the cylinder being loaded from the right side of the gun, for starters.
There are something like 20 comments on it, and not one, until mine, pointed out this obvious flaw. Geez.
Anyway, it's fun for gunnies.