From what I have seen directly, they needed to alter the magazine catch height and maybe more. From what I have read on the 'nets, they are doing at least this. It would seem, based on other AR type mag catches, that they would have to modify the lower in order to raise the catch height, but I'm not familiar enough to really say. LWRC has a whole forum on their website, I think there's info posted there IIRC, but it used to be really hard to read because of the colors but maybe they changed it.
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