5.56x45mm NATO Barrels

Faxon AR-15 Duty Series SOCOM Complete Upper Receiver Assembly 5.56x45mm NATO 16" Barrel

Faxon AR-15 Duty Series SOCOM Upper Receiver Assembly 5.56x45mm NATO 16" Barrel Suppressor Ready

San Tan Tactical Series Ironclad 5.56 NATO Threaded AR Barrel 16 inch Mid Length Nitride Finish Black Medium

San Tan Tactical Everything But The Lower AR-15 5.56x45mm NATO 16inch Upper Receiver Rifle Length 1-7 Twist 1/2x28 Threads Black

CMC Triggers AR Barrel Barrels 5.56 14.5 Threaded Barrel Mid Length

VKTR Industries Hammer Forged DI 5.56mm NATO Threaded Barrel 16in Fluted Carbine Length 1-7 Twist Nitride Black

VKTR V11015001102RP BARREL M16 556 13.7 NITRD

VKTR Industries Hammer Forged DI 5.56mm NATO Threaded Barrel 10.5in Fluted Carbine Length 1-7 Twist Nitride Black

Shaw Barrels AR-15 Barrel 5.56x45mm NATO 12.5" Lightweight Contour 1:7" Twist Nitride

Shaw Barrels AR-15 Barrel 5.56x45mm NATO 16" Midweight Contour 1:8" Twist Nitride

Shaw AR-15 5.56 NATO Threaded Barrel 10.5in No Flute Lightweight Profile 1-7 Twist 1/2-28 Thread Matte Stainless

Dirty Bird 14.5" 5.56 M4 Carbine Phosphate/Chrome-Lined AR-15 Barrel w/ F-Marked FSB

Dirty Bird 11.5" 5.56 M4 Carbine Phosphate/Chrome-Lined AR-15 Barrel w/ F-Marked FSB

Dirty Bird 16" 5.56 M4 Carbine Phosphate/Chrome-Lined AR-15 Barrel w/ F-Marked FSB

Dirty Bird 20" M16A2 Enhanced 5.56 Retro Upper Assembly - Chome-Lined

Dirty Bird 20" M16A2 Enhanced 5.56 Retro Upper Assembly - Non Chrome-Lined

Dirty Bird 16" RECCE V2 .223 Wylde M-LOK Upper Assembly

Dirty Bird 16" 5.56 NATO Midlength 416R Fluted Barrel - Nitride 1:8 Twist

Spikes Tactical SB51605-ML9R 5.56 - 16" Mid-Length LE w/FSP No Bayo Lug Barrel 1:7 Twist

CMMG Barrel Sub-Assm 10.5in MT 4140CM Salt Bath Nitride 5.56mm

Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 13.7"

LBE Unlimited AR 556NATO 1/9 TWIST 7-inch M4 BBL

Rainier Arms Mountain MOD3 Series 5.56 NATO AR-15 Threaded Barrel 10.5 inch Carbine Length 1-8 Twist 1/2x28 Black Medium

Rainier Arms Mountain MOD2 5.56 NATO Barrel 16in 1/2x28 Mid Len Black Medium