@FPSC X10 Help and Dicussens: Along with what Devastaor said, your models are rather blocky. I think you could get a lot more detail out of a mesh for such a high poly-count. I noticed that you had 32 polygons in just the front barrel of the PK 380 alone. Giving us a wireframe render of your models would also help us better understand what we're buying. I suggest that instead of continuing to produce models of this quality, start teaching yourself some kind of modeling theory (stuff like quads vs tris, consistent polygon distribution, and good model flow through face and edge loops) so that you can improve the models that you sell. As far as I can tell, these are unnecessarily high-poly models that won't do us very much good in games because they are not UV mapped and textured, and are not animated. You must also consider how you are going to get these models into a format that your customers can use. Blender has a DirectX Exporter, but it's VERY buggy, so that might not be an option for some of the things you make in Blender.
All of this might sound a little harsh, and if that's the case, then I'm sorry; that was not my intention. I understand that you have every right to sell your work, and I hope you do. More power to you.
I am only making suggestions that I think would benefit you and your business by making your media more desirable to more people. I hope you don't get discouraged by all of this and continue learning and doing work you're proud enough of to sell. Good luck, and happy blending!