LanceOregon
Moderator
It just takes a little practice. The key things are to get good lighting, and have your focus dead on target. Too many times I see photos that are not properly focused, or the gun is just not evenly lite by the lighting, with some of it in shadows.
In C/O's pics, it looks like he shot those outdoors, which is going to give you much better lighting than what you would normally get indoors with a simple snapshot.
In the photo I took of my Kahr, I bounced a Nikon Speedlight flash off the ceiling above the gun, to get the light on it. Nikon DSLRS have a very advanced flash system, and if you use a Nikon Speedlight flash with the camera, it can give you great results like that.
If I had shot the flash directly on the gun, the contrast would have been much harsher, and you would not see as much detail.
I did use some expensive equipment for the shot of my Kahr. My D90 body cost me $900, the lens on it also cost $900, and the flash was $450
However, you don't have to have expensive equipment to get fantastic results. C/O did his photos with a small Canon PowerShot. Likewise, all the amazing shots that Playboy Penguin posts on these forums of his handgun collection are done with a little Canon PowerShot too. However, he has set up a light box to shoot his guns in, and he also places the camera on a tripod, so he can get razor sharp images.
So you don't have to spend a lot of money. Just get nice even lighting, and get the gun in good focus.
Here is a quick and dirty snapshot that I look with a little Canon PowerShot that I own of my SIG P245. I used the built-in flash directly, but adjusted the power down on it, to soften it some. I also made sure my focus was dead on. So just about everyone should be able to at least take a photo like this one below, with a little practice.
! Nice collection. 
