I'm glad its not just me. I want to recycle the board to a few years ago... I know that wouldn't help the board or its growth any, but it really seemed like a different set of posts back then.
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To answer the original question, yes it will work. I have done it a few times on scoped rifles with no front sights. You can also cover a low profile gas block as long as you have another block to hold your handguard end cap.
He wanted to know if you could use MOE handguards with a gasblock instead of a FSB. Like in the picture.