5.56x45mm NATO SBR Barrels & Upper Receivers

CMC Triggers AR-15 Barrel 5.56 11.5 Threaded Barrel

Sons of Liberty Gun Works East India Starter Kit Upper 5.56 13.7 Threaded Barrel

Sons of Liberty Gun Works P3 Fighting 5.56mm 14.5" 5/8x24 Muzzle Thread Midlength P3 Med Contour Chrome Lined/Phosphate Barrel 145-P3FB-556CL

Sons of Liberty Gun Works P3 Fighting 5.56mm 11.5" 5/8x24 Muzzle Thread Carbine P3 Med Contour Chrome Lined/Phosphate Barrel 115-P3FB-556CL

Sons of Liberty Gun Works M4-L89 5.56mm 12.5" Bbl Car Gas L89 Rail A2FH Liberty Fighting Bbl & Mil-Spec Upper Receiver U-M4L89-556-125-A2

Colt Firearms LE6933 Enhanced Patrol Rifle II Complete Upper 5.56 11.5 Threaded Barrel w/ HUXWRX Flash Hider

Colt LE6933EPRII-PRO 5.56mm 16.1" Bbl Matte Black Metal MBUS Sights Surefire Muzzle Device Upper Receiver Conversion Kit LE6933-EPRII-PRO-SF3-CK

Colt LE6933EPRII-PRO 5.56mm 11.5" Bbl Matte Black Metal MBUS Sights HuxWerks Muzzle Device Upper Receiver Conversion Kit LE6933-EPRII-PRO-HUX-CK

Colt LE6933EPRII-SF3-CK 5.56mm 11.5" Bbl Matte Black MBUS Sights Surefire Muzzle Device Upper Receiver Conversion Kit LE6933-EPRII-SF3-CK

Luth-AR M4 Government Barrel 5.56 14.5 Threaded Barrel

Luth-AR M4 Government Profile Complete Upper 5.56 14.5 Threaded Barrel

CMC AR15 Barrels

CMC AR15 Barrels