Sons of Liberty Gun Works M4-L89 5.56mm 16" Bbl Mid Gas L89 Rail A2FH Liberty Fighting Bbl & Mil-Spec Upper Receiver U-M4L89-556-16-A2

Sons of Liberty Gun Works SOLGW 14.50" Upper 5.56x45mm M-LOK Rail - Tactical Excellence - M4L89BSCHF14.5

Sons of Liberty Gun Works L89 Combat V2 AR-15 13.7" Pinned CMV 5.56 NATO Assembled Upper Receiver w/ NOX-9 Flash Hider

Sons of Liberty Gun Works AR-15 L89 Pinned and Welded Complete Upper Receiver 5.56x45mm 14.5" Barrel 13.75" L89 M-LOK Rail with HUXWRX Flash Hider

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

AERO PRECISION M5 20" .308 CMV Complete Upper Receiver w/ ATLAS S-ONE M-Lok 15" Handguard

TACFIRE AR-15 Billet Slick Upper Receiver Black

Wraithworks Billet Slick Side AR-15 Upper Receiver - Black | No Forward Assist or Brass Deflector