Aero Precision M4E1-T Complete Upper Receiver, 16in .223 Wylde Fluted Barrel, ATLAS R-ONE 15in M-Lok Handguard, Anodized, Black, APAR700705M50

Moriarti Complete Upper Receiver, AR-15, 5.56 Nato, 16 Inch Barrel, M4, Carbine Length, 1X7 Twist, 1/2X28 Thread, M-LOK Handguard, Triport, Hardcoat Anodized, Black, MAR-556-16-15-TRI

Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16In, Mid-Length Barrel, 15in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700305M7

Aero Precision M4E1 Threaded No Forward Assist Complete Upper Receiver, 16in 5.56 Mid, RM15, Anodized Black, APAR712705M7

Radian Weapons Model 1 Complete Upper Receiver, .223 Wylde, 16 in Barrel, Custom, Mid Length, 1-8 Twist, 1/2X28 Thread, M-LOK, Deadair Flash Hider, Radian Black, R0025

LWRCI Complete Di Upper Receiver, 5.56Mm, 16 Inch Barrel, 1-7 Twist, Extended M-LOK Handguard, Black, 16In, ICDIU5B16MLXS

Aero Precision Complete Upper Receiver, M4E1-T, .223, 16In, Wylde Fluted Barrel, 15in M-LOK ATLAS S-ONE Handguard, Cerakote, Flat Dark Earth, APAR700315M50

XTS Complete Upper Receiver W/O BCG, AR-15, 223/5.56, 24.75In, 16.5In, Carbine, 1-8 Twist, 1/2X28 Thread, M-LOK, Bird Cage, Black Nitride Finish, XTS-CU-16BK

Aero Precision Complete Upper Receiver, M4E1-T, .300, 16In, Blackout Barrel, 12in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700304M14

Aero Precision AR15 Complete Upper Receiver, 16in 5.56 Mid-Length Barrel W/ Pinned Front Sight Base, M4 Handguard, Black, APAR505631

LWRCI Complete Di Upper Receiver, SPR, 5.56Mm, 16 Inch Barrel, 1-7 Twist, Extended M-LOK Handguard, Black, 16In, ICU5B16SPR

Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16In, M4 Barrel, 15in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700305M6

Aero Precision M4E1 Mid Barrel Complete Upper Receiver W/Flash Hider, AR-15, 5.56x45mm NATO, 16in Mid Length Barrel, 12in M-LOK Handguard, No BCG/CH, Anodized, Black, APAR640231M7

Tiger Rock Complete Upper Receiver, AR 9Mm, 16in Length, 1-10 Twist W/ 10in Super Slim M-LOK Handguard, Black, Large, UB9-FSSM10

Aero Precision M5 Complete Upper Receiver, 16in .308 Mid Barrel, W/ATLAS R-ONE 15in M-LOK Handguard, Anodized, Black, APAR538705M22

XTS Complete Upper Receiver W/O BCG W/ Ce Rail, AR-15, .223/5.56, 24.75In, 16in Barrel, Carbine, 1-8 Twist, 1/2X28 Thread, M-LOK, Bird Cage, Black Nitride Finish, XTSCU16CE

Aero Precision Complete Upper Receiver, M4E1, 16In, 5.56 Mid Pencil Barrel, EM-15 HG Gen 2, FDE Cerakote, APAR640252M39

Primary Weapons Systems MK116 MOD2-M Upper Receiver, 16in Bbl, .223 Wylde, 3-Setting Adjustable Gas System, FSC556 Compemsator, Black, MK1-M2U-223-16

Aero Precision M5 Complete Upper Receiver, 16in .308 SS Mid Barrel, W/ATLAS S-ONE 15in M-LOK Handguard, Anodized, Flat Dark Earth, APAR538115M23

Grid Defense Complete Upper Receiver, .300 Blackout, 16 Inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 Inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR300FDE

Aero Precision Complete Upper Receiver, M4E1-T, .223, 16In, Wylde Barrel, 12in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700304M9

Aero Precision M5 Complete Upper Receiver, 16in .308 CMV Mid Barrel, W/ATLAS S-ONE 12in M-LOK Handguard, Anodized, Black, APAR538104M22

American Defense Manufacturing .223 Wylde 16 Inch Barrel M-Lok Rail Upper Receiver, Black, 16 In, UICCUBLK16M2MLOK

Aero Precision M5 Complete Upper Receiver, 16in .308 Mid Barrel, W/ATLAS R-ONE 12in M-LOK Handguard, Anodized, Flat Dark Earth, APAR538714M22

Stag Arms AR-15 Pursuit Left Hand Upper Receiver, .350 Legend, 16in Barrel, Hanson Profile, 1-16 Twist, 1/2-28 Thread, VG6 Gamma, Black, STAG15113512

Aero Precision M5 Complete Upper Receiver, 16in .308 Mid SS Barrel, W/ATLAS R-ONE 12in M-LOK Handguard, Anodized, Flat Dark Earth, APAR538714M23

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

XTS Complete Upper Receiver W/O BCG W/ 12in Rail, AR-15, 223/5.56, 24.75In, 16.5In, Carbine, 1-8 Twist, 1/2X28 Thread, M-LOK, Bird Cage, Black Nitride Finish, XTS-CU-12BK

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

Felimoa Vice Block Upper Receiver M4 M16 Ar15 Set Of 2

Stag Arms AR-15 Covenant Left Hand Upper Receiver, 6Mm, 16in Barrel, BULL Profile, 1-7 Twist, 5/8-24 Thread, VG6 Gamma, Black, STAG15112201