MAMMOTH ARMS UPPER M4 BARREL 9BBL FREE FLOA

CMMG Banshee Suppressed Upper 9mm 6.5" Black

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

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

FN America AR-15/M4 Barrel - Precision and Reliability in Stealthy Black - 20-100047

Faxon Firearms Duty Carbine-Length Button Rifled Gunner Big Bore Barrel .450 Bushmaster 16", Black

Wraithworks Billet Slick Side AR-15 Upper Receiver - Black | No Forward Assist or Brass Deflector

Faxon Firearms Blowback Button Rifled Pistol Caliber Taper Barrel 9mm 16", Black