The biggest problem I have with the Ruger American stocks are their physical flexibility, and how they contact the barrel pretty easily. It resulted for me in some serious POI shift when using the sling for supported shooting, and when putting any load on the bipod. The stock also had that hollow loudness when tapped. What was frustrating is that it was otherwise sub-MOA with the loads I worked up for it. With its otherwise inherent accuracy, and the glass I have mounted on it costing 4x what I paid for the gun, I decided to have something of a fun, gonzo lark of a project to see what I could do in getting the stock up to speed.
Fun was had, as were overall great results in solving all of this for the most part, going after one problem at a time and then coming back for more (putting in QD sling cups, Spartan Bipod mount, Arca rail segment, etc.). I mean, I went full Bubba-after-tax-return on this stock. Overall, I got about 85% of the rigidity I wanted, and all the performance was "sufficient". However, for the time and component/materials put into it with each of these visits to my work bench, it was definitely not "cost effective". Again, fun lark, but a year or so later I went with a Boyd's Prairie Hunter stock, and have been very happy with it. There's just no way to get the full rigidity out of tupperware that you can get from other stock materials.
If efficiency and cost were my priorities, I would have definitely gone with the Boyd's to begin with. Probably the best upgrade you can do for a Ruger American other than trigger and good glass.