MOA bases for AR rifles...

[LRRPF52]

It does have the 3-piece base. When I checked the reviews (300+ average of 4.6 of 5 stars) one guy did have trouble getting his base/scope aligned L/R so he complained and gave it one star.
I lightly took all the slop out of the three screws then wiggled it all around to make sure that it was mounted and seated correctly, pushed the scope forward to take up any slack and tightened it down. Works great.

We had problems with one before on a really nice Lilja build Grendel that I did for a friend. Having that many separate parts for the base is just asking for trouble when it comes to retaining zero, especially as you run the round count up.

It's a very tempting mount because of the price, but I would avoid it. They make another one that is a solid base that slides over the rail from the rear that is less likely to come loose.