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Is that the polymer one? If so, I think it slides onto the CZ metal cover, so the length of the polymer doesn't make much difference. If it's the aluminum one, then it doies not look right.
Checked mine this morning - FAB Defence forend is the same length as the furniture that came on the gun (CZ858). It does not have that overhang on the rail at the rear end that yours appears to. That looks like the AK model from FAB's site: