This 5.56 chambered 14.5" Pencil 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. It is sometimes known by the brand name of Tufftride, Tenifer 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 workpiece:

Length - 14.5"
Material - 4150 Chrome Moly Vanadium
Profile - Pencil
Finish - QPQ Corrosion Resistant
Gas System Length - Mid-Length
Gas Block Journal - .625" Gas Block Journal
Twist Rate - 1/7 Twist
Muzzle - 1/2x28 Threaded
Weight - 24.8oz
11-Degree Target Crown - Further improve accuracy

SKU: AA-556-145-PEN-ML
UPC: 860006522257

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anyone know who makes this?

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Font type and format look like Ballistic Advantage. BA makes several 'house' branded barrels for folks (including RTB themselves).

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