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, Blue, XTSCUBO10BL

Aero Precision M4E1 Threaded .300 Blackout Complete Upper Receiver, 8In, 1-7 Twist, 5/8X24 Thread, ATLAS R-ONE Handguard, FDE Cerakote, APAR700711M1

Stag Arms AR-10 Long Range Left Hand Upper Receiver, 308 Winchester, 20in Barrel, NJ Compliant, HBAR-CMV Profile, 1-10 Twist, 5/8X24 Thread, VG6 Gamma, FDE, STAG10112444

Aero Precision Complete Upper Receiver, M4E1, 16In, 5.56 Mid Pencil Barrel, EQ-15 HG Gen 2, FDE Cerakote, APAR640252Q39

Geissele Super Duty Stripped Upper Receiver, 5.56Mm, 16.5in Barrel, Carbine Length, 1-7 Twist, Black, 16In, 08-247B

Aero Precision Complete Upper Receiver, M4E1-T, 5.56x45mm NATO, 11.5In, Government, Carbine Length, 1 in 7, 1/2 X 28, 10.3In, A2 Flash Hider, Anodized, OD Green, APAR700396M29

Bear Creek Arsenal BC-15 5.56 NATO 16in Bolt Action Style Upper Receiver, M4 Barrel, 1-8 Twist, 1/2X28, Flash Hider, 416R, UABA-321-556CM41618SS-15ASR

Aero Precision Complete Upper Receiver, M4E1-T, .223 Wylde, 18In, SPR - Fluted, Rifle Length, 1 in 8, 1/2 X 28, 15In, A2 Flash Hider, Cerakote, FDE, APAR700715M51

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

Rock River Arms Completed Upper Receiver, National Match A4 Half Trainer, .22 Long Rifle, 20 Inch Barrel, 1-16 Twist, 1/2-28 Thread, Free-Float Handguard, A2 Flash Hider, Black, 22L0798

Aero Precision Complete Upper Receiver, M5E1, 24in Barrel, 6.5mm Creedmoor, Rifle Length, 1-8 Twist, 416R Stainless Steel, EM15 Handguard, FDE Cerakote, APAR308556M71

Bear Creek Arsenal BC15 12.7x42 18in Upper Receiver, Heavy, Mid-Length, 1-20, 49/64X20, Flash Hide, Parkerized, FDE, UAFC4031127X42MHB1812015FDESR

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

Bear Creek Arsenal BC-10 .308 Winchester 16in Upper Receiver, Heavy, Mid-Length, 1-10, 5/8X24, Flash Hider, Parkerized, ODG, UAFC4009308MHB1611015ODGSR

Stag Arms AR-10 Long Range Right Hand Upper Receiver, 6.5 Creedmore, 24in Barrel, NJ Compliant, HBAR-CMV Profile, 1-10 Twist, 5/8X24 Thread, VG6 Gamma, Black, STAG10100413