If you want a lighter rifle easiest thing is a slimmer contour barrel. An edge stock will help too. Tune the factory trigger instead of a replacement. The M70 is one of the best hunting trigger designs around. Stop there as those are the most critical things and the rest is fluff, nice but not necessary.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli