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If you JUST want bottom or top rails, there's ones that use screws to attach through the holes in the regular grips. If you want side rails, like theguy mentioned you'd need an RIS/RAS handguard.
Keep in mind you really don't get a lot of real estate with the small add-on rails. I had a regular carry handle with an EOtech 551 on the forward top handguard and that was about all I could fit.
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