Those of you on here that know me from my replies know that I like to pick on the Sport 2. Well, that's just it, I pick on it because it's a well made AR. I own a 5 year old Sport 1 and I have not altered it in any way! It shoots as good now as it did on day 1.
I also own a Ruger AR-556. This is what I have done to it since owning it from June 2016; replaced the BCG, replaced the rear sight, replaced the stock and hand guard, and if Ruger or some after market company doesn't come out with an aluminum or steel delta ring (currently polymer threaded type) I will be adding a Mil-Sped delta ring. Now, why did I replace all of those parts on my Ruger and nothing on my Sport 1? Because, the Sport 1 was good like it was and the Ruger needed to be brought up to proper standards.
I will say this as well, I own more S&W firearms than Rugers. But, at one time, I owned all Ruger firearms and not even 1 S&W.