TRIARC Systems TRACK 2.0 5.56 Carbine Barrel - 11.5"

Manufactured by Triarc Systems
SKU: TSRB-556-11
MPN: TSRB-556-11
Manufactured by Triarc Systems
4 Reviews

Available for Backorder

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Use a cutting edge barrel in your next AR build. TRIARC Systems has developed a proprietary rifling that blends the best of both standard and polygonal rifling. This TRACK 2.0 barrel has a single edge area and a polygonal area for separating the grooves.

  • Chambered in 5.56 NATO
  • 11.5" length
  • Carbine length gas system
  • NP3 coated barrel extension
  • Single Edge Polygonal rifling
  • Black Nitride barrel finish
  • 1:7 twist rate
  • 4150 CrMoV barrel steel
  • .750" gas block shelf
  • 1/2x24 threaded

The advantage of this rifling -- known as Single Edge Polygonal (SEP) -- is a significant reduction in the engraving on the bullet as it travels down the bore. This reduction in deformation means the projectile retains a more symmetrical shape, allowing for increased accuracy. The reduced engraving on the bullet has the added benefit of reducing the loss of gas pressures, which helps with retaining velocity.

Bottom line: You can get sub-MOA accuracy with match grade ammunition in the TRACK 2.0 barrel.  

Shoot longer without having to worry as much about cleaning your barrel. TRIARC Systems TRACK 2.0 barrels include a low friction NP3 finish on the barrel extension. You know the TEFLON that makes your frying pan non-stick? The same compound, known as polytetrafluoroethylene, is combined with electroless nickel to create the NP3 finish. 

Not only is this finish more corrosion resistant, but it also increases the lifespan of your barrel by reducing friction. Cleaning it is a snap. Sometimes you can do it with just a soft cloth.

If you’re looking to build a high-quality 5.56 pistol, this 11.5 inch barrel is an excellent choice.  

When you buy a TRIARC Systems barrel, you're supporting a veteran owned business. Iraq war vet Chris Reeves served as a paratrooper in the 82nd Airborne Division and was awarded a Purple Heart for his service. Now, he develops firearms for responsible civilians from his headquarters in Mansfield, Texas.
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Barrel CoatingSalt Bath Nitride
Barrel ContourStraight
Barrel Length11.5
Barrel LiningSalt Bath Nitride
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandTRIARC Systems
Caliber Gauge5.56 NATO
Feed RampsM4
Gas Seat Diameter.750
Gas System LengthCarbine
Thread Pattern1/2 X 28
Twist Rate1:7
Weight21.6 oz.

Ratings & Reviews

4 reviews


Way undergassed

by -

Purchased the non-suppressed model, but it is still far too undergassed to work reliably, even with standard carbine buffer and spring. Ammo used was Black Hills 69gr 5.56, and 77gr.. as well tried Fiocchi 223 62gr and some IMI 5.56 55gr. Each had random problems with short-stroking and not being able to pickup the second round. I tried two BCG, a Toolcraft and an Aero. Neither made any difference. If I could return this, I would.
<br>PA reply : We are sorry that you had this issue with this item. We appreciate the opportunity to make it right, keep an eye out for the return label and thank you for choosing Primary Arms.

Great barrel 10/10

by -

Really quality barrel. Nice gas port size and great accuracy. Would recommend 10/10

Good barrel


Plugged it into a BCM blem upper with a centurion C4 rail and a lower running the Vltor A5 buffer system. Runs great on A5H2 buffer, soft shooting with everything from cheap 55gr FMJ to 77gr OTMs so far. Went shooting with a friend and tried out his suppressor (SF RC2), gun still cycles fine but clearly overgassed, throwing brass at 1-2 O'clock compared to normal 3:30 unsupressed. If I planned to shoot suppressed more often I'd probably use an A5H3. Only downside is cost, but that's everything these days.

Sturdy Barrel

by -

A well constructed and sturdy barrel. The only issue I have with it is the misaligned gas-block dimpling. Had to change out my setscrew gas-block for a clamp style one because the dimpling alignment was so off-centered the gas ports wouldn't line up. Works perfectly otherwise.