Ola Roberto
You did a nice job in this dio and it looks very very good. One thing I would try to change if it is still possible is the same what Scott mentioned. The Barrel of the Gun is in Recoil position and It only does that when it is fired. When Fired the Whole gun would slide down to the back but probably not as far as you show it. It looks like it will fall out of the Guncarriage.
Scott also mentioned the House where the soldier is doing his own business is severely damaged though that is not visible On th inside and outside of the building. You could add some Bricks and woods around and in it.
Further your dio is very good Congrats on that