Have a look at a detailed guide to weapon creation for games by Scribble Mesh.
In this step by step tutorial, the artist will show you the entire process of creating a fantasy weapon from start to finish. “We will start by blocking out our concept in Maya 2018, then transition into Zbrush to define and polish our high poly model. We will then return back to Maya to create our low-poly and UV unwrap our in-game asset. Once we are done with our model, we’re going to bring it into Substance painter to bake and create detailed texture maps. And finally, I will show you how to import your model and texture maps into Marmoset Toolbag for lighting and presentation,” states the description.
Basically, you will get all the skills to create a highly detailed weapon asset for video games. You can learn more and get the tutorial for $9.75 here.