I will do weapon and assets 3d modeling for videogames

Yes, we optimize a high poly model to fit the polycount your project have, we don't make lazy lowpoly assets from cubes and cylinders. Your asset will always have a normal map baking, so you will get nice details in lowpoly models.

Any size you need, or both if you want. Our work is to create the asset, we don't mind if we have to click twice on the export button.

To explain it in an easy way, is a workflow that will give you any kind of look (reallistic, stylized or even handpainted) in a set of textures which contains the base color, roughness, normal map and so on, depending on the game engine you're using.