https://midstatefirearms.com/product/18-spiral-fluted-18-416r-stainless-223-wylde-barrel/

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Premium 416r Stainless 18″ barrel for your Ar15.

  • .223 Wylde chamber (can shoot 5.56 or .223)
  • 1:8 Twist
  • 416r Stainless Steel
  • HBAR Profile – fluted
  • 1/2-28 Threads
  • Mid-Length Gas 
  • .750 Gas block diameter.
  • M4 Feed Ramps
  • Weight: 2.6 lbs approx.
  • Expected Accuracy: 1″ group or better @ 100yds with match grade ammo.
  • Made in the USA