Well, it would be (*%$ing awesome if it would work.
To be honest, I'm a bit burned out on it.
I've tried god knows how many ways to make it work, and simply said, circles suck for this purpose, and gears are even worse. So, from my experience, there is no way to make an Actual transmission work in phun.
* An ejector mechanism
* More stable rounds
* Better latch system
Notes:
Nifty design, especially the forward going bolt.
Like the trail coloring
Firing pin size seems a bit ridiculous
Ideas:
The bolt is really nifty, and you could make it work by a hammer very easily.
You have a lot of space, so you can make a smaller firing pin that can be hit by a Really lock hammer.
Get a spring, make a rail, and make it so that the hammer is released once the rail runs out. Let the trigger go, and the spring loaded "brick" could go back, and cock the hammer.