my understanding is that any modifications will void warranty on that part. i called taurus and ask what kind of sights i could use without cutting the slide and they got kinda pissy. the guy told me that if i switched sights that they(taurus) would not do any warranty on my sights. my guess is if you replace a part in paticular they wont work on that part. i think. but if you do replace parts and have a problem in the future, put the factory parts back on and play the waiting game with warranty. just my suggestion.
It my understanding that the warranty on the "finish" is only one year. Whatever you replace, keep the original and put it back on before sending it back for warranty. Actually, the simple truth is that not many things can get damaged with wear on the 1911 frame.