RE: Rem Model 721
There is not a thing wrong with 721 Rems. I own two of them, a 270 and an '06. Both function well, shoot well, and if you are so inclined, are very adaptable to BDL stocks with floorplate and magazine box and follower. Lots of gunbuilders use them as a starting point.
Another good thing about them, is for some reason, the market value usually is less than others of the same class. Basically, they are just an older 700 ADL.