https://gamesartist.co.uk/sawn-off-shotgun/
3D Artist Zhorzha Oleksandr breaks down his Sawn-off Shotgun, concept by Ivan Taranenko. In this article, Oleksandr covers his workflow from design and blockout to high-poly sculpting, low-poly optimization, UV mapping, baking, texturing with anchor points for wear effects, and rendering with a detailed lighting setup
https://www.artstation.com/jorik
https://www.artstation.com/artwork/ZlPPP0
https://www.artstation.com/parhelion3d