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These chicks may look just like Buckeyes to you now, but they are unlikely to be true to Buckeye body type when they mature. Yes, you could breed the pullets back to a Buckeye rooster and you may get a few birds that are true to the Buckeye standard or it might take one more generation of backcross to get some birds that are good representatives of the standard. I am sure there are breeders who have tried this sort of thing to add genetic diversity to Buckeyes or some other breed, but I am guessing it will take a lot of time and effort to come fully back to the Buckeye standard. And if you do it, you will see an increased incidence of single combs in your birds in the future (assuming the RIRs were single comb). Regarding the egg laying potential, there could well be a boost in the first generation cross. It may or may not carry through as you backcross back to Buckeye. So if you do this, do it with eyes wide open. It will take time and you likely will have a lot of birds along the way which are not good represetatives of the Buckeye standard and should not be marketed as Buckeyes.
Better yet, in my opinion, if you want good Buckeyes, look for reputable breeders and buy good breeding stock from them.