This twist-action ballpoint pen is a very popular style of pen.
It features a rifle clip with scope, and the pen nib is designed to look like an actual bullet.
These Pens use a standard Parker type refill.
 
This pen is made from Lignum Vitae, an exceptionally hard wood with Chrome trim and copper nib.
The clip is a chrome rifle
Lignum Vitae is used to make the bowls in Crown Green Bowling and is polished to a very fine finish.
This would make a unique pen for the person who plays bowls