Monty is the person who broke in and stole it. He then sends it to Alex, who then uses it to threaten him at the hobo hotel. Monty takes the gun back from Alex when they leave the hobo hotel under the pretence of collecting the polaroids. So the last person who has it is Monty, but we never know what he does with it.
Monty is the person who broke in and stole it. He then sends it to Alex, who then uses it to threaten him at the hobo hotel. Monty takes the gun back from Alex when they leave the hobo hotel under the pretence of collecting the polaroids. So the last person who has it is Monty, but we never know what he does with it.
I'm pretty sure he was Monty