How to make a paper gun that shoots shotgun easy – Part 1

How to make a paper gun that shoots shotgun with a trigger – Part 1 Part 2 : https://www.youtube.com/watch?v=eUx8cclv0-g
The Demo: https://www.youtube.com/watch?v=eftTacdVmJI
The new version: https://www.youtube.com/watch?v=CFJDGP82n-g