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TacFire 10.5" 5.56 NATO Black Nitride Complete Upper Assembly - SSBU55610
LaRue Tactical LT007 Stripped Upper Receiver, AR-15 Compatible, .223/5.56, Aluminum, Black Finish, MPN LT007
Zev Technologies UR556FOR AR15 Forged Upper Receiver .223/5.56 NATO 7075-T6 Aluminum Black Hardcoat Anodized
Aero Precision M4E1 Threaded Stripped Upper Receiver - Anodized Black - APAR700201C
Battle Arms Development Workhorse WH556-URS-ODG OD Green Anodized AR-15/M4 Upper Receiver
Q LLC Sugar Weasel Upper AR-15 5.56 NATO 13" Barrel FDE Finish ACC-SW-556-13IN-UPPER
Aero Precision M4E1 Threaded Stripped Upper Receiver - Anodized Black - Minor Cosmetic BLEM - APAR700201BC
Aero Precision - M4E1 No Forward Assist Assembled Upper Receiver - 16" Barrel - .223/5.56 - APAR612218M7
Aero Precision APAR700202C M4E1 Stripped Upper Receiver .223/5.56 NATO Cerakote FDE - APAR700202C
VKTR Industries VK-1 Complete AR-15 Upper, 13.7" Barrel, M-LOK Handguard, 5.56 NATO, Nitride Finish.
Wolf Performance A1 Complete Upper 12.5" 5.56 NATO 1:7 Piston Driven