The armor on an M1 is very strong.
There was once a comparison argument of a company of M1's vs. a Battleship over on Warships1.com.
General consensus was, the battleship's 16" AP shells would not penetrate the Abram's armor. They would flatten the tank, and the concussion would ruin it an everyone inside, but they said the armor would not yield to the 2700lb shell.
Then they said that the Abram's gun COULD penetrate the turrets on the BB. Even though they're around 18" thick.
I found it hard to believe, but if true, that means the M1 has some tough armor.
Oh, and this scenario was at a range the tanks would be able to reach the battleship.....obviously the BB would never get in close enough to expose itself to tank fire. But if it was, its shells would have a flat trajectory, therefore they'd have to defeat the Abrams' armor where it is the toughest.
So as far as the A10's gun, I don't think it would SHRED an M1, but it would penetrate enough to kill it. Only takes one round getting inside the tank and everyone in there is pulp.