You can try to sell the Model of course,
but whatever you have shown really lacks in quality.

A Model without texture is of no help to the customer, as the texturing
and texture finetuning poses the most work.

Weapon Models are thousands on the Market.
Untextured weapons even more.

First get some Models in an acceptable quality(Texturing, animation) done, before considering to really start a business based
on that.

Also dont try to just make Weapons.
A customer (who really knows how graphically balanced game should look)
has no use for wepons wich are made in one style, and the
other graphics in another style.
So you should rather think of making content packs,
Model collections using the same style.