A left handed shooter will still have the pistol basically centered in front of his face, so if he is hit by brass, a righty probably will get hit, too.
One thing to know about lefties using ambi's is to make sure that the lever's downward travel is stopped by the grip panel, rather than the torque being transmitted through both sides of the ambi. If he shoot's with his thumb on top of the safety, he'll loosen the fit of the tongue and groove joint before long.
Good Luck!
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