Does the carrier have the full length guide rails or the short Enhanced guide rails?
Did the carrier wobble or fit loosely in the tool at all?
Is it possible for you to post a picture of the staking? If the carrier has the short Enhanced guide rails I imagine that the staking on the screw closest to the bolt would be shallower (higher on the staking rail) or deeper (lower on the staking rail) than the staking on the rear screw.

