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how can i make a cheap but powerful airgun? Answered

for under £20



google spud guns

just search it there tons of instructables for airguns made out of inexpensive PVC

I would suggest a chamber made of PVC, connected to an inline solenoid sprinkler valve, connected to a PVC barrel. Fill through a quick connect air compressor fitting, or a tire valve. There are better ways, but they are more involved and expensive.