I own both the GSR and a M1A.
- the GSR is light & well thought out...great to hike with
- the M1A is a heavy battle rifle that is also well thought out and reliable
Both are chambered in 308...more barrel options for different intended uses for the M1A.
I don't think I could recommend 1 over the other, barring felt recoil (bolt is obviously a little stiffer) and budget issues.