Here is a few shots of this new adventure I am on. Nothing is tightened until I make my mind up whether to have the valve stem without a spring or with and trigger/ hammer slots are made. Only part from another airgun is the trigger assembly and barrel. Tube is cut from 4130 chromemoly tube 1-1/8 x 0.065. Connecting the two tubes is a 1/8 in. npt hydraulic fitting threaded into 1144 stressproof steel end plugs(tubes will be banded together). The valve is similar to the one Rsterne is using in his hayabusa with the angled 1/4'' port.
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