Receiver is dimensionally incorrect, specifically in feedramp geometry, magazine well geometry, and locking shoulder to receiver face dimensions. While some receivers have been built into functioning rifles, the problems are frequent and consistent enough that I will not work on them and I cannot recommend themNote: I examined a “new” CAI receiver in October 2007. It was of improved finish. The receiver threads were significantly undersize and the hardness of the receiver made chasing the threads with a 1″x16tpi tap very difficult. The rear locking lug was cut incorrectly, 0 degrees instead of correct 10 degree downward slope.