Originally Posted by kraigwy
Now there should be a gap where the gas system fits the stock. You'll have to squeese the stock toward the barrel to see this. Take a q-tip or something and force grease into that space. It should now be free floated except for the grease.
Along with the card stock this is one of the more important accuracy tricks for the M1A. Make sure the metal contact points are smooth and lubed. I use a dab of moly assemble lube.
If you want a good DIY project you can make a NM spring guide out of a piece of drill rod. That is how the originals were made.