Description Stag Arms Upper Receiver The Stag Arms Upper Receiver is available in both right hand and left hand variants. The left handed A3 upper receiver assembly is made to mil-spec standards and includes a picatinny rail on the top, dust cover, installed forward assist, bolt carrier group, and charging handle. The left handed Stag Arms Upper Receiver is essential for a great AR build. Pivot/Takedown Pin Size: Small pin – .250″ Material: Forged and mil-spec with type 3 hard coat anodizing and a picatinny rail on top Bolt Carrier Group: Bolt Carriers made from 8620 Steel, 6A1-4V Titanium or Aluminum Keys made from 4130 Steel Bolts available in Carpenter 158 Steel
