Circumventing Newton's third law through Euler Inertial Forces
Dear moderator @Phi for All,
Thanks to the valuable feedback of the members of this forum (especially thanks to @swansont, @joigus and @Ghideon) I realized where I was wrong (use of wrong definitions and unclear arguments) and I am asking for a third and final round (revised work) regarding the same discussion about the possibility of triggering motion in an isolated system through internal forces (Euler Inertial Forces). Again, I would be thankful to show me where I could possibly be wrong.
The problem with the gun is not the rotation but the use of propellant that implies a real linear force is exerted upon the exhaust of the bullet outwards (action force over the ejected gas) that results in a reaction force pushing the bullet forward. Here clearly applies Newton's third law. However, another action-reaction event is taking place while the projectile and the ejected gas are still in the barrel chamber. In this case, the momentum of the gases is transferred towards the gun, resul