Well here you go. (story is made up)
The FG-22 (experimental name) was being tested by the Imperial right after the Rebellion was formed. The fighter was meant to be a all around utility fighter to be used in any terrains. The final designs were then shot down by the project manager at the first Death Star because the fuel tank had a tendency to explode (he sent the rejection notice just 2 hours before the explosion). There were only 25 models built, but only 3 survived testing (the rest exploded). Out of the remaining 3 only one was ever found. And the founder was a bounty hunter who's name is unknown. He found a way to fix the fuel tank so that well it works. He now uses this as his main mode of transport.