The frame extensions are aluminum.
That's a bullet catch on the barrel that mates up to the dimples on the cylinder to hold the cylinder at each "shell" position. The big hole at the bottom of the barrel was for the catch but was not aligned correctly so I had to move it. The barrel and cylinder are ABS plumbing pipe and the ends are 1/4" plexiglass, the barrel has 2 layers of plexi. The cylinder has six brass tubes running through it to carry the air to the barrel.
Due to the size of the barrel/cylinder the air tubes in the cylinder align with the air valve on the gun frame as if it was shooting the bullet from the bottom not the top as in a standard revolver.
Barrel on first.
If I were to do this again I would put two nuts in the barrel and run the screws up through the frame. Because this way is a pain to get those little screws in and threads in aluminum are problematic. I was going to use four screws but it looks like one of them broke in the frame.
Cylinder with nylon washer on either end.
Brass tube installed. You can see where the air enters the barrel to fire the cork.
Thats a cut down PVC pipe cap on the end
And gun.