Are any of the idiots aware of the long history of "zip guns"?
In western Kenya the deep boreholes (water well hand-pumps) used 1/2" galvanized steel water pipe as pump rods, connecting the pump handle to the piston. Unfortunately, the warriors of the local pastoral tribes learned to make gun barrels from the 1/2" water pipe. The 1/2" was heated & hammered down to roughly .30 cal size. The solution was to replace the 1/2" pipe with 3/4" pipe. None of the warriors were man enough to fire a .75 cal rifle, even if there was ammo available.