Sorry, I just missed this whole thing.
I fully agree with the suggestion that Kula made. As he mention, one of my biggest pet peeves is to keep things uniform. A uniformed unit is a strong unit. So we want to keep all main portions of a sig at 400x120, not 120x400. That would make the sig tall and skinny, not short and fat.
Sorry Kula, had to pick on you about that one.
1) To me the sig lacks focus. "Your focus needs more focus" Sorry I totally love that quote.
2) The main render seems distant. If that was your intentions, then Kula is 100% right. The solder is too pixelated and I could be wrong, but I think the rest of his barrel is missing. The concept of the sniper is great, I personally would make him larger to cover more of the sig with his upper body.
3) You did a great job with some lighting effects. The shadowing on the button right and left fading up is great. I honestly dont see many problems with what you have there, but you can use some more to help tie things in.
4)The text: Kula is spot on again. The quote gets lost in the background and make it difficult to read at first glance. A few things you can do to correct that. Either choose a different color which will help it come out a little or my favorite thing to do, have the color you want, but put a border around it to help it stick out. You can see that effect on your current sig, I have the black letter, which was getting lost in the background, so I put a white blurred border to help it not get lost. Im thinking there is another quote to use, just because Im in a playful mood this morning " Are you a Mexican or a Mexican't " I just love that part.
5) The name is weird to me, Im not sure if you have the yellow and then there is a black text behind it, but if you were trying to do that, its an awesome effect, but what ever is behind it needs some help to come out. Not much, but just enough to say, "Hi, Im here" Beyond that I think you nailed it.
6) the website address. Everything is perfect there except, I think it would look better if it was all in the same caps. But thats just me.
7) Last but not least; The background. You have an awesome concept, but I think it would help your focus out a little if you gave it an ever so slight blur. Once the render is fixed up to have a sharper look to it, adding a blur will help that out.
Overall you have a awesome concept here with great potential and remember, these are just suggestions and if any of this is a stick in the eye, I apologize, that was not my intention.
If you want some more hint or help, please feel free to ask Kula or I for anything. Im always here for that and not only does it help others but helps me too. Trust me, I am by far not the best at graphics and I love to learn more myself.