I've only seen the first two seasons (the third won't be out on Netflix for a while), but what struck me the most was Shane's shooting technique. The character talked all the time about being a firearms instructor but he couldn't even grip a pistol correctly.
I know, it's a relatively stupid thing. And it didn't ruin my enjoyment of the show. But it seems like that would have been an easy thing for the actor to learn in order to add believability to his character.
Heck, on a somewhat related note, I was reading "Debt of Honor" again and noticed that the great Tom Clancy called the Sig P-220 a 9mm and made mention of an Air Force corporal and the USS United States, a Nimitz class carrier.
While I'm not familiar enough with ships to comment on that, I can tell you that the Sig P220 was indeed made in 9mm at one time. I've actually seen one in the used case at my local Gander Mountain before and, besides the caliber, it was also noteworthy because it used the European-style heel-clip magazine release.
Georgia -
The Sheriff's don't know where the guns are, they don't sign the Georgia Weapons Carry License (GWCL).
The Probate Court Judge probably doesn't either as his/her name is usually stamped on the GWCL.
If anyone DID know where the guns were, that probably changed about 15-seconds after the zombie apockyklips was common knowledge.
They shoulda jus' gone to the gun stores and checked the 4473's, it's the only way to be sure.