mwpslp,
I use a transparent plastic pill bottle (with the lid removed) to prop up the subject. Being transparent, it does not cast a shadow, and being plastic, does not scratch the finish on the guns.
I'll prop the subjects up at whatever angle is "best" for the desired image composition; sometimes, the subject isn't even propped up (as in the CZ 75B image).
The camera is usually about a meter away from the subject in order to reduce "fish eye" distortion (it cannot totally be eliminated), with a 2x or 3x zoom used to pull the subject in and fill up as much of the frame as possible.
If you're using a digicam, max out the resolution in order to use all the available pixels to capture as much detail as possible. You can always resize the images on your PC later.
DL