Anything that shakes or rattles on the rifle will affect the consistent accuracy of the rifle. With these divas of rifles you need to repeat the small things - gas lock at the same position (tight at 5 o'clock), gas plug torqued to the same setting (120 to 140 inch/pounds), cleaned and lubed the same way (too much lube makes it shoot differently), stock/trigger lockup nice and tight...blah blah.
HOWEVER...I'll say it again, good gear doesn't necessarily translate to accurate rifles. Its the dummy behind it that makes the biggest impact.