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Geissele Automatics URG-I Near Clone Upper, AR-15 Compatible, 5.56 NATO, 14.5" Barrel, Black/Desert Dirt Finish.
Colt LE6920CK Upper Receiver Conversion Kit .223/5.56 NATO 16.1" Bl
Q LLC Sugar Weasel Upper AR-15 5.56 NATO 13" Barrel FDE Finish ACC-SW-556-13IN-UPPER
Rosco Manufacturing K9 13.95" 5.56 NATO 416R Stainless Nitride Barrel for AR-15
Rosco Manufacturing Stray Dog CL-16.25-556-7-M 16" 5.56 NATO 4150 CMV Phosphate/Chrome-Lined AR-15 Barrel.
Ballistic Advantage 12.3" 5.56 NATO Performance Series Barrel - BABL556033F
Aero Precision - M4E1 No Forward Assist Assembled Upper Receiver - 16" Barrel - .223/5.56 - APAR612218M7
Ballistic Advantage Performance Series AR-15 11.3" 5.56x45mm Carbine Length Hanson Barrel with Low Profile Gas Bloc