How to make a BB Gun out of a Pen (Original Design)

This is a Very simple way to make a BB gun out of a Pen. Can be build in just a few minutes.

Below video will show you how to convert your pen to a BB gun.
And I also show how to make the targets as a bonus.

Thanks for Watching :-)

Material:
Those are very cheap pen I get at the local store, no specific brand require, just find one with the same mechanism.
It is best use with 6mm BBs, but I don't have any of them so I am using using 6mm plastic beats as replacement.