This pen is made out of a old 30.06 Springfield caseing.
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Step 1: Step 1
A 30.06 Casing
A Bic ballpoint Pen
Step 2: Step 2
Take pen apart and you may need to shave a little off of the end you put in the casing. Hammer the pen into the casing until it wont go any further.
Step 3: Step 3
Cut off the excess pen with the knife.
Step 4: Step 4
Measure how much of the pen to cut off.
Step 5: Last Step
After cutting the pen push the pen into the casing. Now your done.