Hammer spring seized
Since you seem to be having more than one issue, I’d either contact the dealer or, if you are in the states, consider sending the Vulcan to Ernest Rowe. He’s got incredible knowledge and tools to solve or improve most pcp pups. I’ve sent him 2-3 guns to polish/tune, improve and they all came back shooting like lasers.
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the hammer spring adjuster is not the black plastic knob on the top!
:rofl:
but the other one around the hammer/cocking indicator. (fingers crossed you sort it, yes with the side panel off will be easier to see whats going on)