Here's a photo by Larry Mayer of the Billing Gazette for an upcoming newspaper story shot with a wide angle lens. It's me photographing a vertical M-21. The bore of the gun is placed over a polished steel rod inserted into a large flat wood block. I have a number of rods for different calibers. I was taught this method more than 25 years ago by John Bivins Jr.
The lamps are old style tungsten bulbs (quite hot!) and the semi-circular reflectors are my own contraption. I use 18% gray roll paper for standard background and colored matte board for colors.
Here's a commercial close-up shot with this set-up on gray. (These are low-rez images for fast loading.)

I've been threatening to write a column on the subject for years. Both Michael and I use the superb Nikor 60mm micro lens.
(BTW, MP is about 5' 15 1/2" tall is why everything of his is on full extension!)