https://midstatefirearms.com/product/20-stainless-fluted-5-56-nato-5r-rifled-18-ar15-barrel/

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Premium 20″ Stainless ar15 Barrel.

  • 5.56 Nato chamber (shoots 5.56 and .223)
  • HBAR Profile
  • 1 in 8″ Twist
  • 5R Rifling 
  • 416r Stainless Steel
  • Rifle Length Gas
  • .750 Gas Block Diameter
  • M4 Feed Ramps
  • 1/2-28 Barrel Threads