| CPC F41A 3/66 (2013.01) | 28 Claims |

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1. A firearm platform comprising: an upper receiver having a barrel end and a buttstock end opposite said barrel end, a pivot lug with a first perimeter opening facing a first direction, and a takedown lug with a second perimeter opening facing a second direction, said first direction being substantially opposite said second direction; a lower receiver having pivot pin and a locking member; wherein the pivot pin enters into the first perimeter opening and the locking member enters into the second perimeter opening; and wherein the first direction is toward the barrel end and the second direction is toward the buttstock end.
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