I have built mani of thease.Some of them with oxigen.There is a major diferense...It is very noisy and many many times more powerful. The combstion chmber is from a PVC pipe and has a volume of about 25 cubic santimetars.The fuel is petrol-because it gives more vapers than alkohol.This guns will never jeam.(sori for my poor english,I live in bulgaria)
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