Tiger Rock AR-15 Complete Upper Receiver, 5.56Mm, 24In, 16in Barrel, M4, Carbine, 1X8 Twist, 1/2X28 Thread, Quad Rail, 15in M-Lok Handguard, Brake, Nitride, Anodized, Black, UB15-15ML

Aero Precision AR-15 Complete Upper Receiver, 5.56, Carbine Length, 16 Inch Barrel W/Pinned FSB, Magpul MOE Handguard, A2 Flash Hider, Anodized Black, APAR502503M64

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

Aero Precision AR-15 Complete Upper Receiver, 5.56, Carbine Length, 10.5 Inch Barrel W/Pinned FSB, Magpul MOE SL Handguard, A2 Flash Hider, FDE Cerakote, APAR502506M3

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

Aero Precision AR-15 Complete Upper Receiver, 5.56, Carbine Length, 10.5 Inch Barrel W/Pinned FSB, Magpul MOE SL Handguard, A2 Flash Hider, Anodized Black, APAR502505M3

Tiger Rock AR-15 Complete Upper Receiver, 5.56Mm, 24In, 16in Barrel, M4, Carbine, 1X8 Twist, 1/2X28 Thread, 10in Quad Rail Handguard, Brake, Nitride, Anodized, Black, UB15-FAR10-FEC

Aero Precision M4E1 Complete Upper Receiver, AR-15, 5.56x45mm NATO, 14.5 in Mid Length Barrel, 12 in M-LOK Handguard, No BCG/CH, Magpul Cerakote, Flat Dark Earth, APAR640232M5

Aero Precision M4E1 Complete Upper Receiver, AR-15, 18 in Rifle Length Barrel, 15 in M-LOK Handguard, No BCH/CH, Magpul Cerakote, Flat Dark Earth, APAR640252M8

Aero Precision AR15 Complete Upper Receiver, 16in 5.56 Carbine Barrel W/ Pinned Front Sight Base, M4 Handguard, Black, APAR505621

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

Aero Precision M4E1 Complete Upper Receiver, AR-15, 5.56x45mm NATO, 14.5 in Mid Length Barrel, 12 in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640231Q5

Aero Precision AR15 Complete Upper, 16in 5.56 M4 Carbine Barrel W/ Pinned FSB, M4 Handguard ,Includes BCG & CH, Anodized Black, APAR505721

Tiger Rock Complete Upper Receiver, AR-15, 5.56 NATO, 16in Carbine Length, 1-8 Twist w/10in M-LOK Handguard, Black, Large, UB15-10ML

Tiger Rock Complete Upper Receiver, AR-15, 5.56 NATO, 10in Carbine Length, 1-8 Twist W/ 10in M-LOK Handguard, Black, Large, UB15-P10-10ML

AIM Sports Inc Complete AR Pistol Upper Receiver W/ BCG, 5.56 NATO, 10.5in Barrel, M4 Profile, Carbine, 1-8 Twist, 1/2X28 Thread, 10M-LOK Free Float Handguard, A2 Birdcage Flash Hider, Nitride, Black, AR5CUB8

Aero Precision M4E1 Complete Upper Receiver, AR-15, 10.5 in Rifle Length Barrel, 9 in M-LOK Handguard, No BCH/CH, Anodized, Black, APAR640221M2

Rainier Arms Rellim Arms AR-15 Take Down Upper Receiver Assembly Combo, Black, RA-TDURA-COMBO

Aero Precision M4E1 Complete Upper Receiver, AR-15, 10.5 in Rifle Length Barrel, 9 in Quad Rail Handguard, No BCH/CH, Magpul Cerakote, Flat Dark Earth, APAR640222Q2

Moriarti AR-15 5.56 Nato M4 Carbine Diamond Cut 12in Mlok Upper Assembly, A2, Black, 16In, MAR-5.56-16-12-M4

Moriarti AR-15 5.56/.223 13.9in Carbine Upper Assembly W/ Pencil Profile, Black, 28.15In, MA-15-556-139-7-CAN

Aero Precision M4E1 Upper Receiver, AR-15, 5.56x45mm NATO, 7 in M-LOK Handguard, No BCG/Charging Handle, Magpul Cerakote, Flat Dark Earth, APAR640212M0

Stag Arms AR-10 Stag 10 Upper Receiver, Assembly, .210 DPMS High Profile, Left Hand, Cerakote, FDE, STAG310880

Next Level Armament NLX556 AR15 556 Nato 16in Complete Upper Receiver, Midlength, 1-7 Twist, Black, NLX302

RISE Armament AR-15, 6mm ARC, 18in Complete Upper Receiver, Rifle Length, 1-7 Twist, 1/2X28, Black, RA-6ARC-CU-BLK-18