I don't know about the quality of current SAI M1A production, but my '01 built Scout was nothing but problems.
It was built with zero GI parts.
First SAI polished the bore and replaced the extractor to correct a FTE problem.
Then they replaced the entire bolt with one of their forged bolts to correct the same FTE problem.
Next they replaced the op rod with GI and installed the GI bolt I supplied. The op rod bowed and released itself from the receiver.
Finally they replaced the trigger group with GI. The trigger pin broke.
Aside from the GI bolt I supplied all work and new parts were supplied under the Lifetime warranty
My case is rare - I never did and never will badmouth SAI. - They did make it right after 3 trips back to the factory.
Maybe they learned a few things from my problematic Scout and improved quality control on subsequent production.
I learned GI parts were a good thing to have in any M14 type rifle...