30 Caliber Bullet Pen - made from a genuine once fired 30-06 brass shell.  Upper barrel is turned from deer antler.   A Winchester rifle clip provides a nice accent.
 
Picture is a typical piece of antler, no two pieces are ever alike, so your actual pen may vary slightly from the picture.  
 
This pen is practical for everyday use.  It uses popular Cross(TM) style refills which can be found at any office supply store.