How does a weapon get made?

They get a concept first, some of it is 2D, some 3D, then they discuss what they like/dislike, change the size, materials. Then they make a blockout that they try in engine and if the sizes work out then they discuss it with Paul Jones and make the first iteration and getting feedback. Once that's done it's just a matter of making sure it's up to the standard of quality that's expected.