I meant to post this earlier (like last year), but kept forgetting.
The following video, is a talk from DefCon 19, which took place last year in Las Vegas.
Pretty good review with videos (how easy to break into) of gun locks, firearm lock boxes & gun safes from a hacker ("Deviant Ollam").
Language is NSFW.
Defcon 19: Deviant Ollam - Safe to Armed in Seconds: A Study of Epic Fails of Popular Gun Safes