You might not save weight, but the gun could balance better.
I've noticed that it's not always about gross weight, but more about weight distribution.
My 20" Savage 10FP weighs 14.5lbs, but I never would have known until I weighed it. The gun handles extremely well. My Remington 700 PSS 26" weighs about 2lbs less, but it's 6 inches longer and it feels heavier to me.
Likewise, my 22" Match M1A is a tank but points well.
FYI, the SCAR is actually heavier than some M4 style rifles but to me it feels much better shouldered and points better (I think it was 1lb heavier than a similar midlength AR).