Low Profile cannons 1.1

After many rounds of trial and error, I have improved the performance of my 3d-printed cannons. By increasing the radius of the internal coil, the rounds now feed more reliably. I was also able to increase the slope of the straight portions, hopefully allowing it to operate on a wider range of down-angles. I also included the Fusion 360 file, so you can view and edit the design yourself if you so desire.

Furthermore, I have incorporated the female-threaded breech and a...