Make sure a 16 - 18.5 pound recoil spring is installed. A lot of bullseye shooters run light springs (~12lb) which will severely beat your slide when you shoot ammunition that makes major power factor. I have seen a guy crack a slide when he bought the gun used, didn't check the recoil spring weight, and shot a bunch of hardball through it.
The collet bushing was made of spring steel and brought out by Colt in the '70's. Production ran until (I believe) the late '80's. They usually don't cause a problem; however, if the inside diameter of the slide was machined too small the fingers of the bushing are stressed and can break.