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I think you are thinking of the CMMG trio of lowers that individually take HK G3 mags, SR-25/AR-10A mags or AR-10B mags.
I do not know of any company who makes a lower that interfaces with an ArmaLite upper, that will take more than one type of mag.
For your upper, you'll need to get an ArmaLite AR-10, Eagle Arms AR-10, Noveske N6, or Aero Precision. I do not believe the CMMG's are available yet.
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