Just from a curiosity stand point and wanting to learn somethings about correct rifle building etc I have watched several videos and a couple of acquaintances set headspace on a couple of different make rifles. My question in regards to setting the headspace is: Do you need to remove the extractor and ejector to set the headspace or can it be done w/o that? It seems there would be some resistence from the ejector spring causing a bit of a false reading.