I think the model looks very simple, it for sure needs more structure and more minor detail to make it look more appealing. You can refer to a reference photo to help you create minor detail. One major thing I noticed is that the model is also missing a trigger, so there is no way to actually fire the gun.
If you take a look at the photo below, you can see the structure is more “refined”. Take the handle for instance, the gun is structured for a proper grip.
I’m not an expert when it comes to modeling guns, but those were just my observations.
Personally I think the model is too simple for sale or be put in an actual game, but with more detail it for sure has potential. Good Luck
The model looks very nice! Nothing much to change, but maybe make the pump more down, from the angle the picture took it at, they both are connecting, the pump & pipe. In other words, a fantastic job!
The price I would say for it is either 620 to 800 R$, a decent amount for a low poly shotgun,
The improvements are maybe separating the pipe & pump father from each other.
It should be in a ROBLOX shooting game! It is better than a gun that uses parts for the barrel, pump, & handle. One shotgun I would prefer for a game with 4,280 players.
I hope you find someone to buy it off from you, or use it for a future creation!