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 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, Heavy, 1-8, 1/2X28, Flash Hider, 416R, UABA-329-223WMHB1818SS-15ASR

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

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

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 16in Upper Receiver, Heavy, Carbine, 1-8, 1/2X28, Flash Hider, Parkerized, ODG, UAFC4042223WCHB161815ODGSR

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

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

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

Troy Upper Receiver Assembly, AR-15, A3, 223 Wylde 14.5in Barrel, Ultra-Low Profile, 12.5in SOCC Handguard, Black, SUPG-A3S-14BT-01

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

Blackout Defense Complete Dual Taper Lock .223 Wylde Upper Receiver Group, Slick Side, 14.5in Mid, Grey, URG-DTL-223W-14.5-SLICK-GRY

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver, 18In, 1-8 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M42

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

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

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver, 16In, Mid-Length Barrel, 1-8 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M9

Aero Precision M4E1-T Complete Upper, .223 Wylde, 16In, Mid Length, 1/8, 15in M-LOK AR15 ATLAS S-ONE, A2, Anodize Black, APAR700305M72

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

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

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

Primary Weapons Systems MK116 MOD1-M Upper Receiver, 16 Inch Barrel, .223 Wylde, 3-Setting Adjustable Gas System, FSC556 Compensator, Matte, Black, MK1-M1U-223-16

Rock River Arms Upper Receiver, EOP .223 Wylde, 20 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0560

Rainier Arms Match .223 Wylde Barrel, 8.5In, 1-8 Twist, 1/2X28, Silver, Small, RAB-M-223-85-P-NF-SAT