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Which version of the RIS are you looking at? Is it the Daniel Defense MK18 which G&P and EbayBanned make? Or one of the new madbull licensed ones (I think these are replicas of the DD AR Light rail)?
My G&P MK18 replica came with the modified barrel nut, and screwed right onto my G&P and King Arms body (although I had to dremel the crap out of the KA to give the screws clearance). The Ebay Banned one should attach similarly but I can't comment on if the threading is the same or not.
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