Faxon Firearms Bantam 16 in Complete Upper Receiver, 9Mm, FX916-U

Aero Precision M4E1 Complete Upper Receiver, 18In, .223 Wylde Rifle Barrel, EM-15 HG Gen 2, Cerakote, FDE, APAR640252M42

Radian Weapons Model 1 Complete Upper Receiver, .300 AAC Blackout, 9 in Barrel, Custom, Pistol Length, 1-5 Twist, 5/8X24 Thread, M-LOK, Deadair Flash Hider, Radian Black, R0027

Stag Arms AR-10 Tactical Left Hand Upper Receiver, 308 Win, 16in Barrel, TAC-GOV-CMV Profile, 1-10 Twist, 5/8X24 Thread, VG6 Gamma, FDE, STAG10111242

Aero Precision M5 Complete Upper Receiver, 18in 6.5 Creedmoor SS Mid-Length Barrel, W/ATLAS R-ONE 15in M-LOK Handguard, Anodized, Flat Dark Earth, APAR538715M44

Ghost Firearms Elite Complete Barreled Upper Receiver, Blue Titanium, GF55FC7GFR9BT

Aero Precision AR-15 Complete Upper Receiver, 5.56, Carbine Length, 16 Inch Barrel W/Pinned FSB, Magpul MOE SL Handguard, A2 Flash Hider, FDE Cerakote, APAR502506M64

Tacfire AR-15 5.56/.233/.300AAC Stripped Upper Receiver W/M4 Feed Ramps, Black, UP01

Ghost Firearms Elite Complete Upper Receiver, .300 Blackout, 10.5In, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9in M-LOK Free Float Hand Guard, A2 Flash Hider, Tactical Grape, GF105E9GFR300GRP

Aero Precision AR-15 Complete Upper Receiver, 5.56, Carbine Length, 10.5 Inch Barrel W/Pinned FSB, Magpul MOE Handguard, A2 Flash Hider, Anodized Black, APAR502503M3

ABC RIFLE COMPANY AR-15 .223 remington/5.56x45mm NATO Pistol 10in Quadrail Handguard Complete Upper Receiver W/BCG And Charging Handle, White, UA15-BR10-QR10-STW

Aero Precision AR-15 Complete Upper Receiver, 5.56, Carbine Length, 10.5 Inch Barrel W/Pinned FSB, Magpul MOE Handguard, A2 Flash Hider, FDE Cerakote, APAR502504M3

Opticsplanet Exclusive Moriarti AR-9 Complete Upper Receiver Complete Upper Receiver, 9mm Luger, 8.3 Inch, 1-10 Twist, MLOK Handguard, Anodized Black, Black, 8.3 Inch, MAR9-8.3-BLK-SHRD