At least in my state reckless standards would have to be that the action is more likely than not to cause harm. I could see if the guy was shooting off rounds, or pointing the gun at people. It just seems insane that leaving it in your room would be reckless even though it's not going off by itself. I would roll the dice at trial, even if I would need an appeal. Fucking insanity - there shouldn't even be enough probable cause to support the arrest since a preponderance of the evidence doesn't support it.