This is my take on the SPAS 12 (Special Purpose Automatic Shotgun), the shotgun that was in Half-Life and also basically every action movie in the 90s that had a shotgun in it.
Another angle.
The model has bones and can be posed. Just the stock has four!
A closer look at the right side, to show the bolt.
A look at the shells and the area that the shotgun is loaded.
A look at the stock unfolded. The odd hook at the end is used to brace against the user’s arm to allow the user to (theoretically) use the gun one handed.
A closer look at the front of the model, showing this very complicated part.
The model in wireframe to show topology.