I recognize that lower you are asking about. You will not need anything but a DPMS multi-tool to remove the castle nut. If you would like I could meet you somewhere and swap out the Ambi-sling attachment for you with regular buffer plate, I have the correct tool. It will take 5 minutes. I will even trade you a "castle looking" castle nut for the single hole one on the lower, if that one is bothering you, they work the same way they just look different.



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