Do they work on a Russian 91. I hear the parts for the keyfun work on the Russian. Is that true? I found a UK source. What scares me is that it doesn't come with orings."You are purchasing a single Makrolon tube only. Any other parts shown in photos are for illustrative purposes only and are not included" Can you transfer them from my current tank? I would like to find a US source. Sorry for all the questions. I think a red tank would look cool just curious if anyone has tried it on a 91.