https://midstatefirearms.com/product/16-300-blackout-ar15-18-barrel-pistol-gas/

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  • 16-inch 300 Blackout Barrel
  • 4150 CM Steel, Parkerized
  • 16″ Length
  • 1:8 Twist
  • 5/8-24 Threads
  • 300 Blackout with .750 Gas Block Diameter
  • Pistol Gas Length
  • Enlarged gas port for reliable cycling