Got a few more details done today. Here are some pics' of the gun tube.
I opened the bore near the breach to allow both the firing emitter and the gun flash to pass through the barrel. There is a pic. of the muzzle, kind of blurry, but it shows the emitter in a black tube and the flash next to it. I also have been fitting and selectively grinding on various parts of the mantlet and the upper portion of the breach to allow a greater and smoother gun movement.

I am also working on the interior to set up recoil and gun movement. i will post some pics later to show how that is coming along.