I thought I stumbled across an AR15 build manual awhile back, before I owned an AR. Now that I have one, there are some things I need to do to it to try and make it more accurate, as I am having trouble with the upper and both sights being a bit out of line (more than sight adjustments can correct for). So, did I imagine this thread/manual on NES? Or should I just go ahead and buy that AR Build Manual from buildyourownar15.com? Thanks guys.