Your missing the point. My 114 year old Krag and my 94 year old P17 don't have recoil springs to replace so nobody has ever changed one out.
So while the M1A is most certainly a reliable rifle. Bolts are more reliable
And a single shot rifle is even more reliable, because it doesn't have a magazine spring.
And a rock is even more reliable because it has no springs.
Which do you consider more "effective"?