CHP 4006 pistols are still available and reasonably priced on GB. Pick up another one and fire standard load 40S&W ammo, not the supped-up +p+ stuff. Be thankful you cracked a readily replaceable 4006 and not a 1006, 1076, 5967, or other hideously expensive or nigh impossible to find model. Strip the old pistol for every part and hang the cracked frame on the wall in your workshop as a reminder to never hot load a S&W vintage auto.