If you're talking a hard focus, in which both front sight and target are in sharp, clear focus, then No. It's impossible. YOu can't even obtain a hard focus on front AND rear sight.
There are two techniques I know of: 1) front sight focus, in which the front sight is in clear focus and the target is out of focus, and 2) target focus, in which the target is in clear focus and the front sight is not.
Personally I practice #2. I've developed the skill to "see" enough of my front sight to determine whether or not the quality of my sight alignment is adequate to achieve a hit in vicinity of my aim point.
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