On another note, one of the things I've been wondering is why they don't use .22 firearms? They would be pretty ideal for the job I would think: lethal enough since you have to do a headshot anyway, easy to transport bulk quantities of ammo, fairly quiet report compared to larger calibers.
I do like how in Season 3 it showed them finally using improvised silencers on their pistols. And why is Michonne the only one using a sword? Something like a Japanese katana is a perfect up close weapon against the "geeks".