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Wolf Performance A1 Complete Upper 12.5" 5.56 NATO 1:7 Piston Driven
Zev Technologies UR556FOR AR15 Forged Upper Receiver .223/5.56 NATO 7075-T6 Aluminum Black Hardcoat Anodized
Wilson Combat TRUPPERBIL Billet Upper 5.56x45mm NATO 7075-T6 Aluminum Black Anodized Receiver for AR-15
Colt LE6940CK Upper Conversion Kit Monolithic 223 Rem/5.56 NATO 16.1" Black
Aero Precision - M4E1 No Forward Assist Assembled Upper Receiver - 16" Barrel - .223/5.56 - APAR612218M7
VKTR Industries VK-1 Complete AR-15 Upper 5.56 NATO 16" Barrel Nitride Finish Black
LaRue Tactical LT007 Stripped Upper Receiver, AR-15 Compatible, .223/5.56, Aluminum, Black Finish, MPN LT007
Sons of Liberty Gun Works Broadsword 89 V2 Upper, AR-15, 5.56 NATO, 13.7" Pinned Barrel, Black Finish.
Sons of Liberty Gun Works L89 V2 Complete Upper, AR-15, 5.56 NATO, 13.7" Barrel, Black Finish.
TacFire 10.5" 5.56 NATO Black Nitride Complete Upper Assembly - SSBU55610
Battle Arms Development WH556-URS Workhorse Aluminum AR-15 Upper Receiver