I have seen two fingerings for the G major chord. 2nd finger on 5th string, 3rd finger on 6th string, and 4th finger on string. The other way i seen the G major chord played was 1st finger on 5th string, and 2nd finger on 6th string, and 3rd finger on 1st string. Just trying to see which fingering do you use the most for the G major Chord.