Alpha Shooting Sports 5.56 NATO Barreled AR-15 Upper - 16"

Daniel Defense 5.56x45mm Upper with 11.5" Barrel, Black - 2312800275047

Aero Precision AR-15 16" MOE Upper 5.56x45mm 1:7 MOE M-LOK Rail SL Mid-Length, Black

Faxon Firearms ARAK-21 12.50" Upper 5.56x45mm, Black

Luth-AR 16" Lightweight Barrel Complete Upper Receiver For 223 Rem/556NATO, Black - BAA3-L16

ATI AR15 Alpha Maxx 16" 5.56 BBL 15" MLOK M4 Stock - ATIGAX556ML15

Aim Sports 16" Complete Upper Assembly 5.56x45mm 1:8, Black - AR5CUB3

Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver 16in M4 Barrel 1-7 Twist A2 Flash Hider ATLAS R-ONE Handguard Black Anodized