Liking the concept...
I very much like the direction your taking the Arthurian legend in. Though, you realize you will now have to explain how Gwen came to own this blade of legend...
This design very much looks like the Excalibur depicted in the movie Merlin. As opposed to this wondrous art piece, it was a simple, but fine looking weapon. What separated it was the sound of it's whoosh through the air, and seeing this picture made me hear that sound once again. As ugly as the concept of a weapon made for mass killing is, the sound it makes will forever be much more beautiful than a gun...
Anyhow, this is nice and I believe a solid 8/10 are well earned.
Might this be something that will happen more in the future?
-DarkX.