To my eyes white washes out the highlights of metal work.

To convey the guns true appearance from a technical standpoint gray would be best. I imagine this is what you're looking for.

To sell a gun a dark background makes the gun "pop" and the contrast looks good.

I have to say though I like the 3D effect that David Drew's mottled background provides.

BTW you can buy a used edition of Photoshop on Ebay relatively cheap. Professional photographers and the like have to keep up with the latest edition and frequently sell the older editions. I have a 5 year old copy for Mac that suits me fine, it has more stuff than I'll ever use.

My problem lies in reconciling my gross habits with my net income.
- Errol Flynn