XTS Complete Upper Receiver W/O BCG, AR-15, 300 BO, 19.5In, 10.5In, Pistol, 1-8 Twist, 5/8X24 Thread, M-LOK, Bird Cage, Black Nitride Finish, OD Green, XTSCUBO10OD

Aero Precision AR15 XL Assembled Upper Receiver, FDE, APAR611320AC

Maxim Defense Industries MDX 510 U.R.G. AR-15 5.56x45mm NATO 10.3 Inch Upper Receiver, Pistol Length, 1-7 Twist, 1/2X28, HATEBRAKE, Black, MXM-47969

XTS Complete Upper Receiver W/O BCG, AR-15, 223/5.56, 16.5In, 7.5In, Pistol, 1-7 Twist, 1/2X28 Thread, M-LOK, Bird Cage, Black Nitride Finish, XTS-CU-7BK

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

Maxim Defense Industries MDX 508 U.R.G. AR-15 .300 AAC Blackout 8.5 Inch Upper Receiver, Pistol Length, 1-7 Twist, 5/8X24, HATEBRAKE, Black, MXM-47929

OP Exclusive Moriarti AR-15 Upper Receiver, 300 Blackout, 10.5In, Pistol, Medium, M-LOK, 1-7 Twist, 5/8X24 Thread, Diamond Cut Free-Float Handguard, A2 Flash Hider, Burnt Bronze, MAR-10-300-BB

XTS Complete Upper Receiver W/O BCG, AR-15, 300 BO, 19.5In, 10.5In, Pistol, 1-8 Twist, 5/8X24 Thread, M-LOK, Bird Cage, Black Nitride Finish, Red, XTSCUBO10RD

Moriarti Upper Receiver Stripped, AR-15, .300 Blackout, 10.5 Inch Barrel, Medium Profile, Pistol Length, 1X7 Twist, 5/8X24 Thread, M-LOK Handguard, Mini Shroud, Hardcoat Anodized, Black, MAR-300-10-SHRD

Tacfire Complete Upper Receiver, AR-15, Lower Parts Kit, 5.56Mm, 7.5in Barrel, Pistol Length, 7in M-LOK Handguard, Anodized, Black, PK556-LPK

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

Aero Precision M5E1 Complete Upper Reciever, .308, 20in Rifle Barrel, 1-10 Twist, 5/8X24 Thread, Free-Float Handguard, Anodized, Black, APAR308554M27

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

OP Exclusive Moriarti AR-15 Upper Receiver, 300 Blackout, 10.5In, Pistol, Medium, M-LOK, 1-7 Twist, 5/8X24 Thread, Diamond Cut Free-Float Handguard, Triport Muzzle Brake, Black, MAR-10-300-TRI

XTS Complete Upper Receiver W/O BCG W/ Ce Rail, USA Edition AR-15, 16.5In, 7.5in Barrel, Pistol, 1-7 Twist, 1/2X28 Thread, M-LOK, Stainless Steel Bird Cage, Black Nitride Finish, XTS-CU-7US

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, Mid-Length, 16 Inch Barrel W/Pinned FSB, Magpul MOE Handguard, A2 Flash Hider, Anodized Black, APAR502503M65

Maxim Defense Industries MDX 510 U.R.G. AR-15 7.62x39mm 10.3 Inch Upper Receiver, Pistol Length, 1-10 Twist, 5/8X24, HATEBRAKE, Arid, MXM-48008

Stag Arms AR-15 Tactical Upper Receiver, 5.56x45mm NATO, 7.5in Barrel, GOV-CMV Profile, 1-7 Twist, 1/2X28, Left Hand, VG6 Delta, Chromephos, FDE, STAG15111921

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, 5.56x45mm NATO, 14.5 in Mid Length Barrel, 12 in Quad Rail Handguard, No BCG/CH, Magpul Cerakote, Flat Dark Earth, APAR640232Q5

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

Aero Precision AR-15 Complete Upper Receiver, 5.56, Mid-Length, 16 Inch Barrel W/Pinned FSB, Magpul MOE SL Handguard, A2 Flash Hider, Anodized Black, APAR502505M65

Maxim Defense Industries MDX 510 U.R.G. AR-15 7.62x39mm 10.3 Inch Upper Receiver, Pistol Length, 1-10 Twist, 5/8X24, HATEBRAKE, Urban, MXM-48126

Aero Precision M4E1 Complete Upper Receiver, AR-15, 18 in Rifle Length Barrel, 15 in M-LOK Handguard, No BCH/CH, Anodized, Black, APAR640251M8

Aero Precision M4E1 Complete Upper Receiver, AR-15, 10.5 in Rifle Length Barrel, 9 in M-LOK Handguard, No BCH/CH, Magpul Cerakote, Flat Dark Earth, APAR640222M2

Maxim Defense Industries MDX 508 U.R.G. AR-15 7.62x39mm 8.5 Inch Upper Receiver, Pistol Length, 1-10 Twist, 5/8X24, HATEBRAKE, Urban, MXM-48114

TRYBE Defense Magnite AR-15 Enhanced BCG/.223 Wylde 10.5in Complete Upper Receiver, Carbine Length, 1-8, 1/2X28, Black, UPPER105223-ENH-V2

OP Exclusive Moriarti AR-15 Pencil Upper Receiver Assembly, 5.56x45mm NATO, 16In, Mid, M-LOK, 1-7 Twist, 1/2X28 Thread, Diamond Cut Free-Float Handgrd, Tri Port Muzzle Brake, Black, MAR-5.56-16-12-TRI

Maxim Defense Industries MDX 508 U.R.G. AR-15 7.62x39mm 8.5 Inch Upper Receiver, Pistol Length, 1-10 Twist, 5/8X24, HATEBRAKE, Arid, MXM-47948

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

Aero Precision Anodized Black AR15 Stripped Upper Receiver, Multi-Caliber 7075-T6 Aluminum, Black Anodized, APAR501603C

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

Dark Storm Industries DS-15, AR-15, 5.56x45mm NATO, 16 Inch, Upper Receiver, SOCOM Profile, Carbine Length, 1-9 Twist, Non Threaded, FDE, DSI-UC5-MOE-N5-FDX

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

TRYBE Defense AR-15 Pistol Complete Upper Receiver, 5.56Mm, 10.5In, 1-7 Twist, A2 Flash Hider, UPPER105556