Airsoft M79 40mm Grenade Launcher

I decided to take over this unfinished project made by zombie8inc to add some features.

Not printed the project yet, I am waiting for the return of the testers.

First part: adds the ejector which was not functional.
https://www.dropbox.com/s/8d9e9wctz135clw/AsmSW1.avi?dl=0

Edit1:
Modifying top latch

Edit2:
problem with the axis of the trigger and firing pin

Edit 3:
latch hole placed in the middle
added safety lock

Test, and Post your printed pieces, please