Moriarti Complete Upper Receiver AR-15 5.56 Nato 16 Inch Barrel M4 Carbine Length 1X7 Twist 1/2X28 Thread M-LOK Handguard Triport Hardcoat Anodized

Grid Defense Complete Upper Receiver 5.56mm 10.5 Inch Carbine Length 4150 Steel M4 Barrel 1-7 Twist A2 Flash Hider Tungsten Gray GD105E9GFR556TG

Tiger Rock AR-15 Complete Upper Receiver 5.56mm 24in 16in Barrel M4 Carbine 1X8 Twist 1/2X28 Thread 10in Quad Rail Handguard Brake Nitride Anodized

WMD Guns AR-15 A3/A4 Upper Receiver Forged W/M4 Feed Ramps Stripped Nib-X White 1-NIBXUF-White

WMD Guns AR-15 A3/A4 Upper Receiver Forged W/M4 Feed Ramps Nib-X Titanium Blue 1-NIBXURF-Titanium Blue

WMD Guns AR-15 A3/A4 Upper Receiver Forged W/M4 Feed Ramps Stripped Nib-X Marine Corp Red 1-NIBXUF-Marine Corp Red

WMD Guns AR-15 A3/A4 Upper Receiver Forged W/M4 Feed Ramps Nib-X OD Green 1-NIBXURF-OD Green

WMD Guns AR-15 A3/A4 Upper Receiver Forged W/M4 Feed Ramps Nib-X Zombie Green 1-NIBXURF-Zombie Green

WMD Guns AR-15 A3/A4 Upper Receiver Forged W/M4 Feed Ramps Nib-X Pink Sherbert 1-NIBXURF-Pink Sherbert

Moriarti AR-15 5.56 Nato M4 Carbine Diamond Cut 12in Mlok Upper Assembly A2 Black 16in MAR-5.56-16-12-M4

Ghost Firearms Complete Upper Receiver Rifle Lower Parts Kit 5.56mm 16in Butt Stock 4150 M4 Barrel 1-7 Twist 14in M-LOK Free Float Hand Guard A2

WMD Guns AR-15 A3/A4 Upper Receiver Forged W/M4 Feed Ramps Nib-X Firehouse Red 1-NIBXURF-Firehouse Red

Ghost Firearms Upper Receiver Pistol Lower Parts Kit 5.56mm 10.5in Carbine 4150 M4 Barrel 1-7 Twist 11in M-LOK Free Float Hand Guard Flash Can

WMD Guns AR-15 A3/A4 Upper Receiver Forged W/M4 Feed Ramps Nib-X Corvette Yellow 1-NIBXURF-Corvette Yellow

Ghost Firearms Vital Upper Receiver Pistol Lower Parts Kit 5.56mm 10.5in Carbine 4150 M4 Barrel 1-7 Twist 9in M-LOK Free Float Hand Guard A2 Birdcage

Ghost Firearms Complete Upper Receiver Pistol Lower Parts Kit 5.56mm 7.5in Pistol 4150 M4 Barrel 1-7 Twist 9in M-LOK Free Float Hand Guard Flash Can

Angstadt Arms AR-15 Complete Upper Assembly With Flash Hider 9mm Luger 16 Inch Barrel M4 Profile 1-10 Twist 1/2X28 Chromoly Black AAUT009016

Ghost Firearms Complete Upper Receiver Pistol Lower Parts Kit 5.56mm 7.5in Pistol Length 4150 M4 Barrel 1-7 Twist 9in M-LOK Free Float Hand Guard

Ghost Firearms Vital Upper Receiver Rifle Lower Parts Kit 5.56mm 16in Carbine 4150 M4 Barrel 1-7 Twist 11in M-LOK Free Float Hand Guard A2 Birdcage

Doublestar DS-4 AR-15/M4 Flattop Upper Heavy Match Barrel 16 Inch 5.56/.223 1-9 Twist A1 Muzzle Device Black ARBU404

Ghost Firearms Elite Complete Upper Receiver .300 Blackout 7.5in Pistol Length 4150 Light HBAR Barrel 1-8 Twist 7in M-LOK Free Float Hand Guard A2