You know, it'd help a great deal if the pictures weren't tiny or horrible quality, but it's not hard to see that this is just another bundle of mediocre weapons made from non-flatshaded clusterforgets of primitives. Seriously, why are you people giving praise for such unremarkable creations. If you're using milkshape, it's really not hard to select everything (Ctrl+A, stupid), and unweld all the vertices from the vertex menu, before exporting. If you're using blender/maya/3ds max, get a program (Milkshape) that isn't a clusterforget of menus and buttons, you're not a professional modeller. If you're using wings3d or shaper for some bizzare reason do as mentioned previously. Milkshape suffices, it does everything you need it to do.
Tl;dr: your models suck, stop polluting the game with this stuff and learn how to model properly.