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good luck in your quest. thats what it will take to find one of these. i know people who have bought complete uppers (if you can even find those now) just to get the rain and parted the other items out for sale.As title states if anyone has one they'd like to sell or know where I can get one please send me a PM. Willing to pay a finders fee if someone helps in a successful find. Looking for the MK18 rail with the front sight post cutout.