GST-AR300 complete upper 16″ SS Barrel in .300 Blackout


1 in stock

AR15 complete upper in .300AAC (Blackout) w Stainless Steel Barrel,  with Nitride BCD  and Standard Charging Handle,  Highest quality Troy Alpha Battle Rail. While Supply Lasts.

SKU: gst-ar300-complete-upper-16-ss-barrel-in-300-blackout Categories: ,



  • 16″ barrel length and chambered in 300 AAC Blackout.
  • Pistol gas port location. Will reliably cycle supersonic and subsonic ammunition.
  • 1:8 twist barrel machined from 416R stainless with 28 to 32 RC hardness.
  • 5/8×24 & threaded concentric to bore with A2 flash hider.
  • 7075 T6 forged aluminum caliber marked upper.
  • Extended M4 feed ramps.
  • Low profile gas block secured in place by dimpling of the barrel.
  • Available with MPI tested mil spec nitride 9310 steel bolt.
  • Test fired and made with 100% U.S. made parts.
  • Troy Alpha Battle Rail 13” with 1 large and 2 small detachable rails


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