No you don't need to buy the whole bolt. There are probably several sources for the Driving rod. The first one that comes to mind is SARCO (part number A4063 driving rod assembly $14.95) at phone 908-647-3800 or find their ad at http://www.sarcoinc.com. Also I am pretty sure Numrich might also have them (http//www.e-gunparts.com), or phone (845)679-4867.