CMMG M4 Contoured AR-15 Barrel - 16.1" - 1:7

ONE HORSE 16" Carbine Gas M4 Contour Barrel 5.56 NATO 1:7

Ballistic Advantage Performance Barrel 5.56x45mm 13.70", Black - Compact and Efficient Barrel - BABL556036F

Faxon Firearms M4 Button Rifled Barrel 5.56x45mm 16", Black

Faxon Firearms Mid-Length Button Rifled Gunner Barrel 5.56x45mm 16", Black

FN America AR-15 16" Barrel 556NATO 1:7 Twist Button Broached, Black - 20100039

FN America AR-15 16" Barrel 1:7 Twist Button Broached, Black - 20100046

Sons of Liberty Gun Works Precision SPR Barrel 6mm MAX 16", Black - Superior Quality - 16PRECISIONSPR-6MAX