If you want to turn your AR pistol into a rifle, all you need to do is add a 16 barreled upper and a stock. Just make sure that if you return it to pistol configuration that you detach the stock first and an forward vertical grips you may have attached to the weapon...f the firearm was already classed as a pistol with a barrel shorter than 16 inches, it cannot be converted to a short barrel rifle and legally registered. An AR15 pistol can be rebuilt as a legal length 16 barrel rifle at a later date, but not as a legal short barrel rifle of less than 16 inches.
Step 4. Add one or two handfuls of garden soil or finished compost to the tumbler (see References 3). Garden soil or finished compost adds beneficial bacteria that helps start the decomposition process.
To effectively polish rocks in a tumbler the rocks must all be of the same approximate hardness. Rocks are placed into a tumbling barrel with varying degrees of abrasive grit and or water. Depending on the hardness of the rocks each step in the tumbling process can take place over a number of days.t the end of the process the stones have a slight luster when dry. The final two steps are the polish and in some cases the burnishing. In the polishing step, rock polish is added in place of grit as well as the plastic tumbling pellets. After further tumbling the rocks should now have a shiny look when dry.