AR Parts in 5.56x45mm NATO

Rock River Arms 16in R4 1-9 CL LTWT Barrel Assembly Black

Rock River Arms 16in R4 1-9 CL LTWT Barrel Black

Rock River Arms 16in Mid LTWT CL Barrel Black

Rock River Arms 7in Pistol CM Barrel Assembly w/A2 Front Sight Black

Rock River Arms 7in Pistol CM Barrel Black

Rock River Arms 16in CAR CM Barrel Assembly Black

Rock River Arms 16in CAR CM Barrel Black

Rock River Arms 14.5in CL 1-9 Barrel Assembly Black

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 10.5in CL 1-7 Full Auto Barrel 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 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 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 16in 1x9 DS-4 Gov't Barrel with Forged Sight Base Black

DoubleStar AR-15 Barrel 5.56x45mm NATO 16" Heavy Contour 1:9" Twist Black Parkerized Chrome Lined

DoubleStar AR-15 Barrel 5.56x45mm NATO 16" Lightweight Contour 1:9" Twist Black Parkerized

DoubleStar Complete Upper Receiver Standard Flattop with M4 Feed Ramps Black

DoubleStar M-16 Full-Auto Bolt Carrier Group BCG Black

Afghan N4 5.56 14.5 Inch FDE DDF Barrel