Two things:
1) the "key" is slightly angled down to provide a force vector more towards the middle of the carrier (not terribly effective IMO) and
2) the rear of the teflon-chromed carrier has "pads" which keep the carrier more centered in the receiver.
I have about 500 rounds through mine so far, and it shows some superficial wear on the leading edge of the receiver extension, but it hasn't visually changed in about 250 rounds.




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