5.56x45mm NATO Upper Receivers

Rock River Arms AR-15 RRAGE 2G Complete Upper Receiver 5.56x45 NATO 10.5" Chrome Moly Barrel 9.5" M-LOK Handguard Black

Rock River Arms Completed Pistol Upper Receiver Mountain .223/5.56mm 10.5 Inch Barrel 1-9 Twist 1/2-28 Threat A2 Flash Hider Black

Rock River Arms AR-15 Complete Upper Receiver 5.56x45mm 16" Barrel

Rock River Arms A4 Upper Receiver Assembly

Rock River Arms A2 National Match Upper Receiver Assembly with National Match 1/2x1/2 .040 Hooded Aperture Rear Sight Black

Rock River Arms Forged A2 Stripped Upper Receiver Black

Rock River Arms Completed Upper Receiver Left Handed RAGE 2G .223/5.56mm 16 Inch Barrel 1/2-28 Thread A2 Flash Hider Black

Rock River Arms Completed Upper Receiver Left Handed RAGE .223/5.56mm 10.5 Inch Barrel 1-9 Twist 1/2-28 Thread Free-Float Handguard A2 Flash Hider

Rock River Arms Completed Upper Receiver Left Handed RAGE .223/5.56mm 7 Inch Barrel 1-9 Twist 1/2-28 Thread Free-Float Handguard A2 Flash Hider Black

Rock River Arms Completed Upper Receiver Left Handed RAGE .223/5.56mm 16 Inch Barrel 1/2-28 Thread Free-Float Handguard A2 Flash Hider Black

Rock River Arms Completed Pistol Upper Receiver A4 .223/5.56mm 7 Inch Barrel 1-9 Twist 1/2-28 Thread Free-Float Handguard A2 Flash Hide Black

YHM BILLET SPECTER XL CARBINE 5.56MM 1:8 TWIST YHM-MODEL-57XL-8

YHM BLACK DIAMOND CARBINE XL 5.56MM 1:8 TWIST YHM-8820-8

YHM MR7 SERIES UPPER RECEIVER GROUP 5.56MM YHM-7305-8

DoubleStar DS-4 AR-15/M4 Flattop Upper Heavy Match Barrel 16 inch 5.56/.223 1-9 Twist A1 Muzzle Device Black

DoubleStar Complete Upper Receiver Standard Flattop with M4 Feed Ramps Black

Noveske AR-15 N4 DDF Complete Upper Receiver 5.56x45mm NATO 14.5" Barrel NSR-13.5 M-LOK Handguard Black

Noveske AR-15 N4 DDF Complete Upper Receiver 5.56x45mm NATO 11.5" Barrel NSR-10.75 M-LOK Handguard Black

Noveske Gen 4 Light Recon CHF 5.56 16 Bazooka Green Complete Upper Receiver

Noveske N4 Recon AR-15 Complete Upper Receiver 5.56x45mm NATO 16" Barrel FDE

Noveske Rifleworks Gen 4 N4 Afghan Stainless 5.56 NATO Complete Upper Receiver - 14.5" - FDE

Noveske AR-15 N4 Infidel Pinned and Welded Complete Upper Receiver 5.56x45mm NATO 13.7" Barrel NSR-15 M-LOK Handguard FDE

NOVESKE N4 INFIDEL 13.7 INCH UPPER - BAZOOKA GREEN

Noveske AR-15 N4 Shorty Upper Reciever Assembly 5.56x45mm 10.5" Barrel NSR-9.75 M-LOK Handguard FDE