Wheeler-Dealer

Cumulatively exchange 500 military-grade 5.45 rounds at the trade kiosks - the counterpart to Scrooge. Whenever you pass an exchange kiosk, convert military rounds into dirty/handmade ammo or gear; it all adds toward 500. You can have both this and Scrooge: reach 500 held at some point for Scrooge, and over the whole game spend 500 total here.