On to the guns.
Here's what I built. Not too shabby. Rough enough for an ork anyway. Now on to it's mate.
Using a dakkagun for scale and as a guide:
A narrow cut off from the rectangle tube for the ejector port:
I used a Dremel to get the shape in the barrel sleeve. I then used a hobby knife to cut out the holes.
All done! I'm saving the rivets for later, just in case the interfere with the overall boss build.
I did glue these halfpipes to the inside of the shootas to make final mounting to the Bike forks easier.
That's it. By breaking the it down into it's basic shapes, then adding gubbins later it's not too hard to make these. Scale up the components to make bigger gunz. Easy.