The problem is that the Ares/Star buffer tube (and the receiver) is slightly out of spec compared to real steel dimensions. The diameter of the Ares/Star buffer tube threading is very slightly smaller than the real steel dimensions. This means the groove cut into the threading to index the buffer tube has less "wall" (threading on either side of the groove) and the notch you see on the buffer tube plate can sometimes slip out.
I'm actually using a real steel buffer tube plate on my Star right now, so I know it's doable without modification. Just need to know what you're doing.
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