Bear Creek Arsenal BC-15 .223 Wylde 10.5in Bolt Action Style Upper Receiver, M4, 1-7, 1/2X28, Flash Hider, 416R, UABA364223WCM410517SS10ASR

Bear Creek Arsenal BC-15 .223 Wylde 16in Bolt Action Style Upper Receiver, Straight Fluted Heavy, 1-8, 1/2X28, Flash Hider, Black Nitride, UABA-383-223WCHB1618MF-15ASR

Bear Creek Arsenal BC-15 .223 Wylde 16in Bolt Action Style Upper Receiver, M4, 1-8, 1/2X28, Flash Hider, 416R, UABA-331-223WCM41618SS-15ASR

Bear Creek Arsenal BC-15 .223 Wylde 7.5in Bolt Action Style Upper Receiver, M4 Barrel, 1-7 Twist, 1/2X28, Flash Hider, Parkerized, UABA-342-223WPM47.517-7ASR

Bear Creek Arsenal BC-15 .223 Wylde 16in Bolt Action Style Upper Receiver, Heavy, 1-8, 1/2X28, Flash Hider, 416R, UABA-329-223WMHB1818SS-15ASR

FM Products Mike-15 .223 Wylde Gen 2 Complete Upper Receiver, 22.25 Inch, 12.5 Inch Barrel, Mid Length, 1-8 Twist, 1/2X28 Thread, Free-Float, Nitride, Black, MIKE15U-223-G2-12.5M-2

FM Products Mike-15 .223 Wylde Gen 2 Complete Upper Receiver, 24.75 Inch, 16 Inch Barrel, Intermediate, 1-8 Twist, 1/2X28 Thread, Free-Float, Nitride, Black, MIKE15U-223-G2-16I-2

Bear Creek Arsenal BC-15 .223 Wylde 20in Bolt Action Style Upper Receiver, Straight Fluted Heavy, 1-8, 1/2X28, Flash Hider, 416R, Black, UABA352223WRHB2018FSS15ASR

Bear Creek Arsenal BC-15 .223 Wylde 16in Upper Receiver, Heavy, Carbine, 1-8, 1/2X28, Flash Hider, Parkerized, Tungsten, UAFC4044223WCHB161815TNGSR

Bear Creek Arsenal BC-15 .223 Wylde 16in Upper Receiver, Heavy, Carbine, 1-8, 1/2X28, Flash Hider, Parkerized, ODG, UAFC4042223WCHB161815ODGSR

Bear Creek Arsenal BC-15 .223 Wylde 16in Right Side Upper Receiver, Heavy, Carbine, 1-8, 1/2X28, Flash Hider, Parkerized, Tungsten, UASCC5044223WCHB161815TNGSR

Bear Creek Arsenal BC-15 .223 Wylde 16in Upper Receiver, Heavy, Carbine, 1-8, 1/2X28, Flash Hider, Parkerized, FDE, UAFC4043223WCHB161815FDESR

Blackout Defense Complete Dual Taper Lock .223 Wylde Upper Receiver Group, Forward Assist, 14.5in Mid, Black, URG-DTL-223W-14.5-FWD-BLK

Blackout Defense Complete Dual Taper Lock .223 Wylde Upper Receiver Group, Forward Assist, 11.5in Carbine, Grey, URG-DTL-223W-11.5-FWD-GRY

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

Lantac USA LLC SF 15 DMR, Complete Upper Receiver, 223 Wylde, 18 Barrel, Fits AR15, Anodized Finish, Black 01-FA-223-DMR-UPR

Blackout Defense Complete Dual Taper Lock .223 Wylde Upper Receiver Group, Forward Assist, 11.5in Carbine, FDE, URG-DTL-223W-11.5-FWD-FDE

LANTAC 16in Recon Complete Upper Receiver, .223 Wylde/ 5.56Mm, 1/2-28 UNEF, Rifle Length, Black, 01-FA-223-RECON-UPR

Rock River Arms Completed Upper Receiver, FESP .223 Wylde, 16 Inch Barrel, Mid Lenght Profile, 1-8 Twist, 1/2-28 Thread, Free-Float Handguard, Brake, Black, FE0500

Blackout Defense Complete Dual Taper Lock .223 Wylde Upper Receiver Group, Forward Assist, 11.5in Carbine, Green, URG-DTL-223W-11.5-FWD-GRN

ABC RIFLE COMPANY AR-15 .223 Wylde 18in Stainless Barrel 17in M-LOK Rail Complete Upper Receiver W/BCG And Charging Handle, Black, UA223-BR223-3ML17

Rock River Arms Completed Upper Receiver, X-1 .223 Wylde, 18 Inch Barrel, 1-8 Twist, 1/2-28 Threat, Free-Float Handguard, Brake, Tan, XAR0700T.V1

Rock River Arms Upper Receiver, EOP .223 Wylde, 16 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0510

Radian Weapons Model 1 Complete Upper Receiver, .223 Wylde, 14.5 in Barrel, Custom, Mid Length, 1-8 Twist, 1/2X28 Thread, M-LOK, Deadair Flash Hider, Radian Black, R0024

Aero Precision Complete Upper Receiver, M4E1, .223 Wylde Mid Barrel EQ-15 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 16In, APAR600251Q9

Rock River Arms Upper Receiver, A4 .223 Wylde, 18 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0525

Lantac USA LLC Urban Tactical, Complete Upper Receiver, 223 Wylde, 11.5 Barrel, Fits AR-15, Anodized Finish, Black 01-FA-223-UTP-UPR

Lantac USA LLC SF 15 Patrol, Complete Upper Receiver, 223 Wylde, 14.5 Barrel, Fits AR-15, Anodized Finish, Black 01-FA-223-PATROL-UPR

Primary Weapons Systems MK114 MOD2-M Upper Receiver, .223 Wylde, 14.5in Bbl, Pinned FSC556 Compensator, Black, MK1-M2U-223-14-PW

Primary Weapons Systems MK111 MOD2-M Upper Receiver, .223 Wylde, 11.85 Inch Barrel, Matte, Black, MK1-M2U-223-11

Rock River Arms Completed Upper Receiver, Predator Pursuit .223 Wylde, 16 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0572

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver, 18In, Fluted Barrel, 1-8 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M51

Savage Arms MSR15 Competition Upper Receiver .223 Wylde 18 Barrel Black 0C784900, BV23275

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver, 16In, Mid-Length Barrel, 1-8 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M9

Midwest Industries Upper Receiver Group, 16 Inch Barrel, .223 Wylde, 15 Inch Combat Series M-LOK Handguard, Mid-Length, A2 Flash Hider, Black, MI-N16CRM15-U

Rock River Arms Upper Receiver, EOP .223 Wylde, 24 Inch Barrel, Varmint Profile, 1-12 Twist, Free-Float Handguard, Black, AR0580