SAI AR15 Box Fluted Barrel


Introducing the SAI Box Fluted barrel available in 14.5" 5.56 configuration.  The SAI Box Fluted barrel leverages a 45 degree gas port that reduces the firing impulse of the rifle while leveraging an intermediate gas system. The barrel has a fluted square which makes the barrel more predictable, reduces barrel whip, increases heat dissipation, and reduces weight.

This barrel goes through a unique process where the barrel and receiver extension are individually serialized and then sent to be individually coated - Black Nitride (Barrel outer/inner), TiN (Titanium Nitride) Receiver Extension.  They are then reunited and hand torqued for a precise fit.  

These barrels come with a Lifetime warranty- so if you can shoot them out we will give you a new one, free of charge.


  • Proprietary Box Flute Design
  • Length: 14.5" 5.56
  • Weight: 1.662 LBS
  • Intermediate Gas System (5.56)
  • 45 degree gas port
  • Accepts a .750 Gas Block
  • Black Nitride Barrel - Outside and Inside
  • Titanium Nitride (TiN) Receiver Extension
  • M4 Feed Ramps
  • Lifetime Warranty

Please note that all NFA rules apply to any barrel under 16".


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