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pmags dont fit in armalite ar10,or they would have been my first choice.
ArmaLite has a NEW model, called the AR-10A, it is designed to accept SR-25 magazines, or Pmags.
ArmaLite made minor design changes to both the upper and lower so they could use the SR-25 style mag. These new upper/lowers are not compatible with the AR-10, now called the AR-10B. Clear as mud, right?