The Ballistics Advantage 16" 5.56 Government Profile Midlength AR 15 Modern Series Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension. With a mid length gas system and .750" gas block journal.
Specifications:

Caliber or Gauge	223 Remington/5.56 NATO
Length	16"
Model	AR Barrels
Twist	1:7"
Sights	None
Bore Type	Rifled
Finish	QPQ Corrosion Resistant
Type	All Purpose
Chokes Included
Choke Configuration
Barrel Type	Government
Ammo Type	Tactical
Barrel Features	1/2"-28 tpi