not gonna happen. its a major drawback to m1a's. they are freekin heavy.
maybe contracting out some custom carbon fiber company to make you a carbon fiber stock... but with all the reinforcements i would need it still wont come close to a light weight m4 clone
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent