Tube #1 is 45 cm long with a 4 cm diameter, tube #2 10 cm with a 5 cm diameter. The longer one will become the barrel, the smaller one will become the end piece of the muzzle. The tubes are clear, the wrinkles you see are caused by the protective wrapping which will be removed later. The smaller one had to be shortened a bit with a dremel. To achieve a good result I had wrapped some masking tape around the middle.
Then I added some pencil spots around it using a ruler.
Two more masking tape stripes were attached at both sides of the marks, leaving a small alignment channel for the dremel cutting tool.
The parts were separated.
And another run because I had taken the wrong measurements..!
The electronic components are somewhat of an experiment. I don't know if it works so wish me luck, please!