I had sent my AR-10 back to ArmaLite for the upgrade. In less then two week I had it back in my hands. I also had the muzzle brake removed and had an flash compressor put on. Now I am waitting on my CAR stock. The rifle is an AR-10A2 that has an 16" barrel. I even order two packs of 5-20rd mags with my order and got them very fast. I have not shot the as of yet, but will soon. The rifle look good with good with the black compressor with the heavy SS barrel. I know this post is worthless without pics, but I have not had the time to take pictures yet.
So if you need the upgrade, do it.
Bob the Nailer.