5.56x45mm NATO Barrels

DRD Tactical U556 13" QD Rail System

LWRC International LWRC IC-A5 5.56mm NATO 14.7" 1:7" P&W Bbl Patriot Brown Complete Upper Receiver ICA5U5PBC14P

LWRC International LWRC IC-A5 5.56mm NATO 10.5" 1:7" 1/2x28 Tungsten Grey Complete Upper Receiver ICA5U5TG10S

LWRC International LWRC IC-A5 5.56mm NATO 14.7" 1:7" P&W Bbl Tungsten Grey Complete Upper Receiver ICA5U5TG14P

WMD Guns 5.56 NATO Threaded AR Barrel 16in GP M4 Mid Length 1-7 1/2x28 Nitride Black 556B16M1-7 GP

WMD Guns 5.56 NATO Threaded AR Barrel 16in GP M4 Carbine Length 1-7 1/2x28 Nitride Black 556B16C1-7 GP

WMD Guns Barrel Extension 5.56 NiB-X Stainless Steel

Centurion Arms Recce Barrel 14.5in Blasted Stainless NSN 9305.20.9000

Cloak Industries OEM MFR56 5.56x45mm NATO Threaded Rifle Barrel 13 inch 1-7 Twist Nitrided

Cloak Industries OEM MFR56 5.56x45mm NATO Threaded Rifle Barrel 16 inch 1-7 Twist Nitrided

LWRC International LWRC ICMKII 5.56mm 10" 1/7" 1/2x28 Patriot Brown Short Barrel Rifle Upper ICMKIIU5PBC10S

LWRC International LWRC ICMKII 5.56mm 14" 1/7" 1/2x28 Flat Dark Earth Short Barrel Rifle Upper ICMKIIU5CK14S

LWRC International LWRC ICMKII 5.56mm 14" 1/7" 1/2x28 Black Short Barrel Rifle Upper ICMKIIU5B14S

Mitchell Defense DOC 18in 5.56 NATO Upper Receiver Stainless Steel Barrel Flat Dark Earth Finish M-LOK Free-Float Handguard

Mitchell Defense DOC 18in 5.56 NATO Upper Receiver Stainless Steel Barrel Black Finish M-LOK Free-Float Handguard

Mitchell Defense DOC 18in 5.56 NATO Upper Receiver Carbon Fiber Wrapped Barrel Black Finish M-LOK Free-Float Handguard

Mitchell Defense DOC 16in 5.56 NATO Upper Receiver Cold Hammer Forged Chrome-Lined Barrel Jungle Green Finish M-LOK Free-Float Handguard

LWRC International LWRC ICMKII 5.56mm 12" 1/7" 1/2x28 Tungsten Grey Short Barrel Rifle Upper ICMKIIU5TG12S

LWRC International LWRC ICMKII 5.56mm 12" 1/7" 1/2x28 OD Green Short Barrel Rifle Upper ICMKIIU5ODG12S

LWRC International LWRC ICMKII 5.56mm 12" 1/7" 1/2x28 Flat Dark Earth Short Barrel Rifle Upper ICMKIIU5CK12S

LWRC International LWRC ICMKII 5.56mm 10" 1/7" 1/2x28 Tungsten Grey Short Barrel Rifle Upper ICMKIIU5TG10S

HIPP Customs AR-15 Threaded Barrel 16'' Mid Length Black Nitride Black 16.0"

LWRC International LWRC ICDI Direct Impingement 5.56mm NATO 16.1" 1:7" 1/2x28 Bbl FDE Complete Upper Receiver ICDIU5CK16ML

ODIN Works .223/5.56 Barrel Nut Black