AM 16" 5.56 M4 Profile Nitride 1:7 Carbine Gas Barrel
 
This 5.56 chambered 16" M4 Profile Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension.
Quench Polish Quench (QPQ) is a specialized type of nitrocarburizing case hardening that increases corrosion resistance. Also known as Black Nitride or Melonite. QPQ is a huge improvement over Chrome Lined barrels. Unlike chrome lining, where the chrome is built up on the surface, QPQ converts the surface without the risk of dimensional build up. The technique is used when two or more of the following properties are required in a work piece.
 
Barrel
Specifications
Caliber
5.56
Length
16"
Material
4150 Chrome Moly Vanadium
Profile
M4
Finish
QPQ Corrosion Resistant
Gas System Length
Carbine
Gas Block Journal
.750"
Dimpled?
No
Twist Rate
1:7
Muzzle Thread
1/2x28 TPI
Weight
27.2oz
Barrel Extension
M4 Feed Ramps
Target Crown
11 Degree