Earlier quoted context omitted.
Involving a firearm in the commission of a crime is an instant ticket on the Felony Express. If he hadn't had a gun (first offense or not, discharged or not, loaded or not, real or not) he likely would have been out a long time ago. When you have a gun in that situation the number of things that can go wrong increases by an order of magnitude. The adrenaline could make him pull the trigger when he didn't really mean…
What if the gun wasn't even loaded? Of course, this is absolutely irrelevant to the question. What's done is done. He just wants to move forward and I'm really more interested in helping him to find options.
Even if you have a plastic toy you spray painted black, that's the same thing as having one in the chamber. The teller still thinks s/he is going to die.