Complete Upper Receivers Include Ejection Port Cover, Rod, Spring, and Forward Assist.
10A4 complete upper is our standard flat top upper with the standard port door rod used for all AR-10’s that will utilize a 2 piece handguard. If a free float handguard is to be used, the 10002000 10T complete upper is what you need.
Thread Size: 1-7/16" X 18 UNEF-3A
Upper Receiver: A4 Forged Flattop Receiver 7075-T6 Aluminum