Back in 2011, a 13 year old me decided to try out 3d modeling in a program called anim8or, mostly just screwing around with primitives. Shortly after, once I discovered how to manipulate polygons, I made my first proper 3d model, an Ithaca Model 37 shotgun intended as a fallout 3 mod. Since then, the M37 has become somewhat of a benchmark for me, I'd make a new one every year or two to see how far I have come. A bunch of these have been lost forever, but I managed to track down a few.
2012 and 2014 are intended for old, non-pbr rendering, and 2012 even lacks a gloss map entirely.