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RADICAL FIREARMS 223 Rem/5.56 NATO 16in Black Complete Upper Assembly (CFU16-5.56SOC-15RPR)

AERO PRECISION AR15 5.56 NATO / 223 Rem 20" Complete Upper Receiver w/ Carry Handle | Black

AERO PRECISION M4E1-T 5.56 NATO 11.5" Complete Upper Receiver | Black

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PATRIOT ORDNANCE FACTORY P415 Edge Upper receiver assembly,5.56, 10.5" barrel, 9" M-Lok MRR Rail, Black Anodized (01269)

RADIAN WEAPONS Model 1 .223 Wylde 10.5in Black Complete Upper Receiver (R0023)