For the screw, I would call EMF. Boyd Davis, president of EMF, is a very nice gentleman, and has helped me out in the past. As for the spring, I would buy nothing but a Wolff reduced power spring from Brownells. All my Colts and clones have one! Absolutly the best! While you are at it, replace the trigger and bolt spring with a wire one from them also. Why wait until it brakes? (which it will) Stay safe. 44 Man