As for our soldiers, I can understand their need for a collapsible stock, but that seems a lot less important for the average Joe - most of us don't have a body armor.
And yet, "most" is not "all".
IME, the M1A/M14 is a f--king heavy-ass rifle to begin with. Then again, last time I picked one up was my junior year of college, and I wasn't in very good shape then.
If you like everything about the rifle except the weight, hit the gym.
Personally, if I were going to built a .308 semi, it'd probably be an 18" M1A in either the Sage or Troy chassis.