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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.
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Read what I wrote more closely. I know you can zero a standard rear sight with the wrong front sight, but when you have the right front sight and one of the out-of-spec rear sights, you run into issues similar to the OP.
Regarding the OP, since it seems you need a front sight made for a receiver-height rail, LMT makes a rail-mount front sight that looks like the standard fixed triangle FSB.