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

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, Coyote Rifle .223 Wylde, 20 Inch Barrel, 1-9 Twist, 1/2-28 Thread, Free-Float Handguard, Vortex Flash Hider, Black, AR0587

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

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

Rock River Arms Upper Receiver, A4 .223 Wylde, 16 Inch Barrel, Varmint Profile, 1-8 Twist, Free-Float Handguard, Black, AR0500

Aero Precision M4E1 Threaded .223 Wylde W/ ATLAS R-ONE Handguard Complete Upper Receiver, 18 Inch Barrel, 1-8 Twist, A2 Flash Hider, Magpul Cerakote, Flat Dark Earth, APAR700716M76

Aero Precision MOD4 15 18 Inch 223 Wylde PROOF 5.56x45mm M4E1-T Complete Upper Receiver, Kodiak Brown, APAR700021D111

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

Troy Upper Receiver Assembly, AR-15 A3, 223 Wylde, 11.5in Barrel, Ultra-Low Profile, 10.5in SOCC Handguard, Black, SUPG-A3S-11BT-01

FM Products Mike-15 .223 Wylde Gen 2 Complete Upper Receiver, 17.75 Inch, 9 Inch Barrel, Pistol Length, 1-8 Twist, 1/2X28 Thread, Free-Float, Nitride, Black, MIKE15U-223-G2-9P-D

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

Stag Arms AR-15 3-Gun Left Hand Upper Receiver, 223 WYLDE, 16in Barrel, Hanson Profile, 1-8 Twist, 1/2-28 Thread, VG6 Gamma, Black, STAG15113202

Aero Precision M4E1 Threaded .223 Wylde Complete Upper Receiver, 18In, Wylde SS QPQ Rifle Length, 1-8 Twist, A2 Flash Hider, 15 in M-LOK ATLAS R-ONE Handguard, Black Anodized, APAR700705M73

Aero Precision Complete Upper Receiver, M4E1-T, .223 Wylde, 16In, SPR - Fluted, Mid Length, 1 in 8, 1/2 X 28, 15In, A2 Flash Hider, Cerakote, FDE, APAR700715M50