You can't convert the Ruger American that uses the stock mags to use the AR mags you have to get the model that is purpose made that uses the AR mags.
So you could not take a 223 American with the standard mags and swap the stock and magwell with the AR magazine type stock and magwell and have a functioning rifle? Is the feed ramp different or are the differences even more pronounced?
Is the reverse true? Could you swap the adapter from a x39 model into an ar15 model and run the 5.56 version with mini14 mags?
Is the reverse true? Could you swap the adapter from a x39 model into an ar15 model and run the 5.56 version with mini14 mags?