<human>: Per usual, this wasn't today but a handful of years ago. 

I was a competitive pistol shooter for a couple years but with my work schedule and the obscene cost of shooting, I decided I would sell one of my setups and cut my losses on the competitive circuit. I made a post on Facebook about a pistol for sale and had a lot of inquiries but no one looking to spend the type of money I was looking for. Then my cousins boyfriend called me and said his friend was looking for a new pistol and he would vouch for him. They're both gym rats and work out together every day. 

The buyer comes to my house in his brand new Mercedes, wearing all designer clothes. He was ex navy and was working as an engineer now. He was easy to talk to and knew his way around firearms. He shot the pistol a few times, then we did the necessary paperwork for a transfer of a gun in my state. I make sure to do everything legally because you never know what will come back to bite you in the ass. He handed me a wad of $100 bills and drove off. 

I never thought twice about the sale until a month or two later when my cousin sends me a link to a news story. Apparently he decided to carjack someone in a beat up grand am with a .45 pistol.. He was seen doing it and followed by a Good Samaritan who called him in to the police. They recovered the weapon and arrested him on the spot. 

The story gets much deeper from there.. Including leaving the country, smuggling cash, orgies, a plot to assassinate a Venezuelan gang member, kidnap a prominent Venezuelan business man, and landing himself on interpol's most wanted list.. but thankfully I keep my paperwork very organized and never got in any kind of questioning.

Can you summarize the given text in a few sentences?
<bot>: sold a gun to a well off engineer, which he used to carjack a lady in a 2000 grand am. Now I want to buy the movie rights.