Alexanderredhook,
OK, you asked. Flasht already said it but maybe you didn't understand how critical what he said is.
The M1A is designed for iron sights. Yes, there are good mounts available. Brookfield Precision and Smith Enterprise both build quality scope mounts for the M1a. BUT....
No matter what you do, this rifle is designed for use with iron sights. The alignment of the eye from a proper cheekweld to the stock is way too low for effective use of a scope. Without this proper cheekweld you will not shoot consistantly with an M1A using a scope.
I know, they win matches. But notice these matches don't use scopes??? The things are accurate and reliable. I know. I have one. Still, NFG with scope. I have a Tasco SS on a Smith Enterprise mount. Nothing wrong with the scope, mount or rifle. But together it doesn't work.,
The only solution is a new stock from McMillan. Add $450-600 before you are done having it installed properly. Or you can try some of the aftermarket leather/??? pads on the stock. I've tried 'em. Bzzt. No good.
If I wasn't lazy and rich, I would sell my M1A and buy something else with the money. Might do it soon just to clear out some room in the safe.
James