Cannon - Spring/Black Powder Action

This is my very first 3D "thing" and I'm not sure at all if the Print settings are even close what they should be.
I was training Inventor Essentials -course and designed this Cannon just for curiosity, when students wanted to do "something different than just boring machine parts".

Let me know how if worked if you try it out!

I have also made spring-action version of this for indoor use.
Will upload that next.