AR-15 16 Bull Barrel 1-9 Twi

FN America AR-15 16" Barrel 556NATO 1:7 Twist Button Broached, Black - 20100039

FN America AR-15 16" Barrel 1:7 Twist Button Broached, Black - 20100046

Faxon Firearms Mid-Length Button Rifled Gunner Barrel 5.56x45mm 16", Black

FN AMERICA Barrel AR-15 5.56/223 16" Carbine Length

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

Rock River Arms AR-15 A4 Complete Upper Receiver 9mm Luger 10.5" Chrome Moly Barrel 6" Handguard Black