FN America Barrel, 14.7", 556NATO, 1:7 Twist, Hammer Forged, Carbine Gas System, M4 Contour, Fits AR-15, Matte Finish, Black 20-100405
Specifications:

Caliber or Gauge
Length	14.70"
Model	AR-15
Twist
Sights
Bore Type
Finish	Manganese Phosphate
Type
Chokes Included
Choke Configuration
Barrel Type	Carbine Length
Ammo Type
Barrel Features	Chrome-Lined