I'm no expert with PVC, but the 1 project I made with PVC was utterly cheap & easy! Just go to your local Home Depot-type store and spend some time in the PVC isle. What I did was literally played puzzle-time and pieced together my prop on the floor of that isle -- lots of strange looks, but anyways.
Then just use spray paint (NOTE: I found it works better to do multiple light layers from afar, versus concentrated close sprays that resulted in dripping).
As for cost, I can't recall the total but for a long rifle-type prop using several pipe sizes, widths, & strange connector pieces, it was far less than $10.
Best of luck with your Russia!!