Hi, long time lurker, first time poster.
Currently, I have two ARs, a 6720 and a 6920. Both are pretty much stock except for the addition of an Aimpoint PRO. I just got my NFA trust finished and have a 762 SDN 6 on order. One of my lowers will be registered as an SBR and I plan on adding a DD MK18 upper to it.
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