I purchased a full sized SR1911 in June of 2016. I now have over 5K rounds down the tube, almost exclusively handloads.
The pistol has had no part failures.
I also change the recoil spring once every 2K rounds or so. These springs are cheap - $2 apiece off of shopruger.com. I bought a dozen to keep on hand.
I've replaced the factory front sight with the Novak FO front sight also advertised on shopruger.com. The original did not fail, as I simply wanted a better sight picture that the FO provides me.
As mentioned above, the grip screws were loosening after each range trip. I would simply tighten them back up - no o-rings or loctite ever used. At about the 1K round mark, the screws simply stopped loosening on their own and have remained tight ever since.
As an aside, I had the SR1911 at the range on last Saturday morning. After shooting a bunch of paper on the pistol range, I brought the pistol to the 100 yard rifle range and shot on a steel plate. And to my surprise, I had several "dings" on the steel plate. At 100 yards, the FO front sight covers the entire plate. No doubt more luck than skill to have hit it a few times, but it sure was fun!
Bayou