Purchase the NBS A2 Birdcage + Gas Block + Stainless Gas Tube Kit here!

Buy your barrel parts as a kit and save. This bundle features NBS' excellent nitrided .750 Low Profile Gas Block, A2 birdcage and your choice of stainless steel gas tube.

NBS Black Nitride A2 Birdcage

  • .223/5.56
  • Jet Black Nitride Finish
  • High grade steel construction
  • Directs flash away from shooter
  • Reduces muzzle rise
  • Includes crush washer
  • Lifetime warranty

NBS Low Profile Gas Block

  • .750 diameter
  • High grade steel construction
  • Jet Black Nitride Finish
  • Includes stainless roll pin
  • 2 hex head set Screws/li>
  • Lifetime Warranty

Gas Tube

  • Stainless steel construction
  • Beveled alignment hole
  • Stainless roll pin included
  • Lifetime Warranty

Take a look at our other AR-15 Parts here!

Advertised price expires 05/31/2021