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Machined from 6061 Aluminium  Mil Spec Black Hard Coat Anodized Thicker wall for increas..
M-16 A-3 Stripped Upper Receiver flat-top with Picatinny rail, Anodized Black Upper rec..
  Non Reciprocating AR-15 Side Charging Upper Receiver - Stripped  Manufacturer:&nbs..
  The Spike’s Tactical M4 flat top stripped upper receiver is machined from a Mil-Spec 7075 ..