I had a factory folder in the 80s. I put a scope mount on it, and it was pretty clear it could not hold a good group. I tried working with it but it never shot well. I traded it on a Colt HBar in 1986 when they came out with 1/7 twist. I don't regret that trade.
Back then, Ruger was supposed to make a real M14 clone in 308. It was cataloged, but never sold.