Weapon design I did a few years ago for an undisclosed project through GameCo Studios. The project this was for is canned as far as I know but the client allowed me to show the work I did for it, so more updates should follow.
Where possible I'll try and include some of the work in progress. The initial brief called for a Calico-style helical magazine on top of the gun, which was tricky to make look cool because of the small size of the gun. I went for a semi-transparent magazine at first but for game mechanical reasons it was easier to stick with a simple display on the back of it.