Uses 3 #10-24 screws, a random spring, and a nail
Latches ok and is stiff enough for me, but not perfect
Print all the mounting parts solid for maximum stiffness
Fits - https://www.printables.com/model/1032185-battle-axe-shell-ejecting-nerf-shotgun-3d-printed
The author remixed this model.
Custom mount and hinge specific to the Battle Axe