Stock Status: Right To Bear 18" SPR Barrel w/ Ops 12 - 5.56 (Rifle-Length)
This 5.56 chambered 18 inch Special Purpose Profile Rifle-Length Modern Series Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension. This barrel features a longer .750" profile dimension necessary for proper installation of the OPS Inc 12th model collar and suppressor.
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 - 18"
- Material - 4150 Chrome Moly Vanadium
- Profile - SPR
- Finish - QPQ Corrosion Resistant
- Gas System Length - Rifle-Length
- Gas Block Journal - .750" Gas Block Journal
- Twist Rate - 1/7 Twist
- Muzzle - 1/2x28 Threaded
- Weight - 341oz
