You are absolutely right, Mac- but the pic rail I have on the receiver right now is too high for the Williams rear sight / extended AR15 front sight I have set up right now. I finally have the barrel, trigger, magazine and stock combo all set up just the way I want it for this Fall's rimfire league - the sights are the last piece of the puzzle. I could just go to a higher globe front sight, of course - but military peep sights are what I've shot with for 35 years, and I don't want to change just yet.