The top rail of the handguard should line up/be level with the flat top rail on your receiver.
Ok, I re-read your post, and yes, you are correct. If you get the correct length handguard that corresponds with your barrel and gas system length- you will be fine.
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Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day)
I suspect a thing or two... because I've seen a thing or two.
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