Oleg Volk is an undisuted master of the craft.
Head provides a great composition primer for your gun pics.
Finally, South Park adds some humor so we don't take this stuff so seriously.
You don't have to be Chardin or Cezanne to take good gun pictures. Expensive equipment can make for nice quality, but it cannot replace a discerning eye and a feel for placement within the frame. With Oleg giving inspiration, Head providing instruction and South Park keeping us from getting to damned wrapped up in it all, some beautiful work should result. Break out those megapixels!