Modified barrel for Spring-powered 4.7" naval gun toy

I've been having fun with Fishbreath's great Spring-powered 4.7" naval gun toy. Thank you! I modified the barrel to allow for a higher elevation (higher aiming) and added a stop for the shells so they don't fall down and interfere with the firing arm.

I sliced the shell 1mm across the long side so it prints well on its side. This changes the layers to be longwise to reduce interference with the layer lines inside of the barrel when firing.