TRIARC Systems 5.56 TRACK 2.0 Mid-Length AR-15 Barrel - 16"

Manufactured by Triarc Systems
SKU: TSRB-556-16
MPN: TSRB-556-16
Manufactured by Triarc Systems
6 Reviews

In Stock

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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
  • 16" length
  • Mid-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
  • 1/2x28 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 rifle, this 16 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 Length16
Barrel LiningSalt Bath Nitride
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandTRIARC Systems
Caliber Gauge5.56 NATO
Feed RampsM4
Gas Seat Diameter.750
Gas System LengthMid-Length
Thread Pattern1/2 X 28
Twist Rate1:7
Weight29 oz.
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

6 reviews

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  • 1 star
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Could serve as a lightweight SPR barrel


The hybrid profile is awesome. Groups don’t open up too much with heat, and keeping 5 rounds sub moa is a piece of cake with match ammo.

Decent barrel


This barrel is moa or better with match ammo. It is however way undergassed. Plan on purchasing with a sprinco reduced "yellow" buffer spring.

Great Barrel

by -

Have one of these on a Geissele build so decide to replace a factory barrel with one of these. They perform great.

POI shift suppressed.

by -

Over four inches low and one inch left POI shift when suppressor is added. Just FYI for those who wish to protect your ears. You will have to choose to zero with the can on, or off. Unsuppressed the barrel groups well with 55gr-75gr projectiles. None of my other barrels have this much POI shift with can on, can off.

Accurate barrel


I love this barrel. I only worry about the future of triarc and whether or not these will be around in the future.

Softest shooter I have


This instantly became my favorite barrel. Perfectly gassed so it shoots VERY soft. I brought a handful of springs and buffers when I zeroed and a standard milspec carbine spring with 2.9 oz carbine buffer (not even H) cycled perfectly and locks back empty mags every time. I use a 50 yard range and it’s sub moa at that distance. When the 13.9” is available I’ll try it as well.