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Some manufacturers use the wrong (A2) FSB on their fixed-sight flattop rifles as a cost-cutting measure. Since the A2 FSB is shorter than the F-marked FSB for flattop rifles, they make their detachable carry handle sights lower to compensate. The result is that when you use the out-of-spec carry handle on a rifle with the correct height front sight (Or vise versa), it becomes impossible to zero.
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The F-marked front sight base was developed for carbines. If you use a non-F marked FSB on a carbine, it isn't impossible to zero, but the front sight post (assuming they include one that's tall enough) will stick up past the protective ears of the FSB.