I have a friend that has a M1917 that he has owned for many years and never fired. He recently decided that he may want to fire it, so he purchased the "go" and "no go" headspace gauges. He removed the extractor from the bolt (he was told this was the correct procedure) and found that the bold would close just fine on the "go" gauge. He then tried the "no go" gauge and found that the bolt would also close on the "no go". So, how big a problem is this? Is the rifle safe to shoot? If not, how do ya fix it?