I like using white carpet or the wall.

 I know this is low tech, but try to follow me on this one:

Put a piece of paper under it.

Or just lay your gun down on the floor.

I would if I could but I don't actually have anything white. I just decided I'll go for some good lighting using the pool table light. It makes white connectors glare but otherwise it's good enough. Plus I could always try going for a green screen effect and putting my gun in a scene of a movie or something XD.

I use the white posterboard seen in my slideshows.

I do the same thing!

(That or a sheet laid out on hardwood.)

i use my hardwood floor, my carpet, and in one i think i used a seahawks blanket.

put it on an ugly carpet! The gun will standout easy!