Metro 2033 - How To Maximise Money

Something very interesting i found out about Metro 2033. Instructions: In the Armory area of Metro 2033 two guns will be lying on a bed, a Volt Driver & a Heavy Automatic Shotgun. Swap your current weapon for the Heavy Automatic Shotgun or the Volt Driver & exchange it for the Duplet shotgun from the gun store and receive money bullets whilst exchanging. Repeat the process for the remaining gun & pick up your original gun. :) Please note: If you want to use the Volt Driver or the Heavy Automatic Shotgun you DO NOT have to do this, it's completely up to personal preference. Weapon Information: Volt Driver: http://metro2033.wikia.com/wiki/Volt_Driver Heavy Automatic Shotgun: http://metro2033.wikia.com/wiki/Heavy_Automatic_Shotgun