Jeff Porter
Gold $$ Contributor
In my pea brain, if I had access to a 12” piece of 1.25” Delrin (https://www.onlinemetals.com/en/buy...yUHt-51iUM1CB2YbCZMdYA-3dWHg-uiwaAtwuEALw_wcB) and a machinist friend I would bore and thread one end to match the barrel threads and bore the center to just over bore diameter. Mill in a notch for solvent addition if you want.