I would do what I did. I purchased a very used 870P (rusty barrel, beat to heck stock). As others have said, it was racked a lot (beginning and end of shift load/unload), but didn't look shot a lot. The barrel was pitted on outside, but shiny on inside. As I wanted a 20" barrel anyways, I put a new 20" IC barrel on it (and sold the old one), new furniture, and gave the rest of it a good cleaning. I also replaced the various springs and extractor (how to's on AIP Tacticals website-good folks there) and was good to go. As it's been used, the action is slicker than snot, and I can be confident that the wear parts are all new. I've shot a 100 or so rounds through it to confirm reliability and patterning, and it's good to go for not too much money.