Just put about 150 through my P229 E2. Bought it used, probably less than 100 rounds through it, about a month or so ago. I have put about 500 through it total. I noticed after this trip to the range that the slide has a rattling sound when you shake it a little bit. I noticed this when I went to put it back in my holster. Don’t think it was doing it before. Didn’t have any issues with it at the range I just found it kind of strange. Any idea what this is? I figure firing pin but it does this no matter what, cocked, decocked, loaded/unloaded, slide off the frame, slide on the frame. Not a slide/frame fit issue... Doesn’t matter, it’s rattling all the same. Seems to only do it when side to side. Local gunsmith that I use for everything said it is strange and to keep an eye on it but if there’s no problem performance it’s probably not a big deal. Just wanted some opinions