You can spend a butt load of $$$ get a Noveske and be very happy with your VERY ACCURATE AR from them...You'll worry and fret over every scratch and clean her meticulously, probably start a log to keep round counts and such...or build a no nonsense tack driver you arent afraid to hurt...its an AR..not an F Class...
I was at the range last November with my M4 shooting her off the bench, shes the bottom gun here. I've got less than a $1000 in her with a Comp ML2. All Bushmaster.
Up comes a dude with a Noveske Race Gun..I mean all tricked out...sits down at the bench next to me...we talk...shoot a little..talk some more...He's got $3000+ in his set up...doodads hanging off every rail...we shoot some more, put up new targets...I'm noticing and he is too that my gun is just as accurate as his and he is making looks at my targets all groups running about an inch or so...I'm using the MagPul BUIS...he's using his ACOG...I slap on the Comp ML2 and we do some speed drills in front of the bench...He makes the comment that, TODAY...he realized you didn't have to spend $3000 to have a great rifle...I agreed and said " You know the difference between my rifle and yours besides money?" He said what... I said I'll do this with mine in a heartbeat...I threw the rifle to the ground, stood on it, bounced up and down ( I didn't jump, I aint stupid)on it, picked it up, dropped it, stood on it again, then inserted a mag and emptied it onto four different steel silhouettes...He just stood there and watched... I said come on...do it with me...he just looked at his Noveske and shook his head...
80-90% of the accuracy on an AR is UPPER Receiver and a good trigger...spend you money there...you can get high dollar gear and not do as well as some mid level stuff...don't get me wrong there is some junk out there...stick around here and the other AR15 forum and learn..then pull the trigger and don't look back...
Oh yeah...the top rifles got glass...pretty good mid level glass...I would not drop her and stand on her...Bushy HBAR upper on a YHM lower. She put ten rounds into .78 of an inch on her first trip to the range.