I removed my 15-22s barrel this afternoon, to thread it for the flash hider. I have read on here, that the barrel nuts are generally not very tight. Well, mine was every bit of 20 ft/lb tight! I began to think that I was gonna have to make a barrel clamping block for the vise, instead of the rubber coated jaws I was using. I also noticed that the barrel nut threads had been liberally oiled at the factory. Just a couple things I noticed during the process.