3D printed stocks can improve the look of a gun. Wood filament can be used to mimic an actual wood stock. Different lengths-of-pull can be achieved with different butt plates or lengthening the model. These models can be downloaded from Thingiverse. A printed stock is a good compliment to the 3D printed forearms.   Even if you don't have access to a 3D printer you can order parts from printing services such as CraftCloud