This is my first Instructable so I hope you like it.
Step 1: Tools and Supplies
A Bullet casing. (Doesn't really matter how big but I used a 7mm)
A .22 cal empty pellet
A pen with a pointed casing
Copper Nail Polish
Brasso. (Or other metal polish)
Hot glue gun
Hand pruners or something similar
Step 2: Polish the Casing
Step 3: The Pen Casing
Take the pen apart and get the ink tube and the top casing part.
Mark the pen casing bit 19mm from the top and use some sand paper to file down to the mark.
Step 4: The Ink Tube
Step 5: Glueing the Pen Casing
Put the pellet over the ink tube.
Hot glue the tube and the pellet in place (make sure to keep the ink tube standing in the middle) and let it dry.
Then add more glue and quickly add the pen casing.
Step 6: Sand the Pen Casing
Step 7: Paint the Pen
I also used clear nail polish over it but you don't have to do this.