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Thread: Mini Review / First Impressions TriArc (Feddersen blank) barrel. 12.5 mid gas

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    Mini Review / First Impressions TriArc (Feddersen blank) barrel. 12.5 mid gas

    Ok posting this as a new thread due to interest in the TriArc barrel

    In my search for a sub moa 11.5 to 12.5 barrel I got many great suggestions and decided on TriArc due to reports of super high accuracy across a broad range of ammunition as well as being a soft shooter

    I received and built up my TriArc (Feddersen blank) barrel. 12.5 mid gas

    First impressions were that the barrel is devoid of markings. The only markings are on the barrel extension end. A small S on the left at 6 oclock and a small 4 on the right at 3 oclock. Anyone know what these denote? Also included were some stickers (lol?)

    I measured the gas port with my OriginCal (certified) but it's not the best way to measure as it's not the exact diameter due to the offset tips of the internal?
    Anyway - I got .073 and .075 measuring twice.

    My SLR7 Sentry Ti adjustable gas block slipped right on

    The barrel was pre-dimpled through the nitriding which was surprising. I'll need to grease that dimple to prevent rust right?

    Weight was right at 662g (1 lb 5.94 oz) which is 21.94 oz

    Heavier than my Spikes/FN 11.5 pencil which came in around 17.496oz. The TriArc looks like an HBAR next to the Spikes/FN pencil LOL
    I am a bit disappointed as the TriArc site advertised the barrel at 1.37 lbs and this is 1.46 lbs. Looking back on the site, I see all the barrels up to the 14.5" are advertised at 1.37 lbs. The 16" says 1.71 lbs

    That seems a bit sloppy at best and sketchy at worst.

    I have Reman Black Hills 77gr OTM, 55gr IMI and 62g MagTech right now. If anybody has some favorite commercial ammo they'd like me to test I'd be amenable.

    I'm planning on ordering some IMI 69gr RazorCore (77gr is OS) and some Speer Gold Dot LE 75gr SP unless someone says otherwise?

    Upper Build List:

    TriArc 12.5 Track 2.0 Barrel 5.56/Midgas
    San Tan Upper receiver billet
    2A Balios Lite 10.0 MLok Rail / AL Nut (Seasoned 3X and Torqued to 45ftlbs)
    SLR7 Ti adjustable gas block
    Brownells Nitride LW BCG
    Griffin Stealth Flash Hider

    Info from TriArc site

    Length 12.5"
    Material 4150V grade Milspec B-11595E Chromium-Molybdenum-Vanadium (CrMoV)
    Profile TRACK
    Finish Nitrocarburizing ( BLACKNITRIDE™ )
    Extension Finish Np3
    Gas System Mid-Length
    Gas Block Journal .750" Diameter w/ 1" Length
    Twist Rate 1.7"
    Muzzle 1/2x28 Threaded
    Weight 1.37 Lbs
    Other Info Barrels are turned on centers and never chopped down from longer lengths
    Patent Number WO 2013074132 A1
    Last edited by joeg26er; 06-25-18 at 10:15.

  2. #2
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    Garand Thumb did a review on YouTube of a Triarc setup. I don't remember which barrel length though.

    Check it out, he had good things to say.

    Sent from my Pixel 2 using Tapatalk

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    Just got back from the range. Not too exciting, it's indoors and max of 25 yards and dimly lit.

    This was just a gas block tune and function test of the build. Rough RDS sight in for 50 yard zero.

    However, compared to my Spikes/FN 11.5 build this TriArc Track 2.0 barrel seems to group much tighter

    I used the brass clock method to tune the gas.

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    Forgot to mention my SLR7 Gas block adjustment

    Using the "brass o-clock" method I set it 10 clicks from fully closed to get ejection to around 3 oclock.
    Tried to use carbine buffer minus weights plus regular carbine spring and got some instances of the bolt not fully cycling. Pushing / denting rounds
    Finally settled on Using regular carbine buffer and spring
    Brownells Light Weight Nitride BCG

  5. #5
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    Quote Originally Posted by joeg26er View Post

    First impressions were that the barrel is devoid of markings. The only markings are on the barrel extension end. A small S on the left at 6 oclock and a small 4 on the right at 3 oclock. Anyone know what these denote? Also included were some stickers (lol?)
    Those markings are a manufacturer variant of "M4" markings.

    Any further updates on this?
    Black River Tactical
    BRT OPTIMUM Barrels - 16" BRT EXT Gas System
    BRT Covert Comps 7.62 + 5.56 + 9mm
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports
    BRT MicroPin Gas Blocks .750" & .625"
    BRT MarkBlue Gas Tubes - BRT EXT and PDW Lengths

  6. #6
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    Quote Originally Posted by joeg26er View Post
    Forgot to mention my SLR7 Gas block adjustment

    Using the "brass o-clock" method I set it 10 clicks from fully closed to get ejection to around 3 oclock.
    Ejection pattern is an unreliable way to tune your gas block. To properly set the gas block, load a single round in the mag, load the AR and fire it. The AR should eject and lock back. Keep closing the gas block until the AR ejects but does not lock back. Open the gas block one click and verify that it will eject and lock back. Then, open it one more click, if needed, to ensure reliable function. If ejection pattern is weak or erratic, replace the ejector spring, then replace the extractor spring with a Colt extractor spring.

    Carbine buffers are too light, even with an adjustable gas block. Use either an H or H2 buffer.
    Last edited by MistWolf; 07-11-18 at 10:20.
    Quote Originally Posted by sinister View Post
    There are two kinds of nations in the world -- those that use Metric and those who have walked on the moon.
    http://i115.photobucket.com/albums/n289/SgtSongDog/AR%20Carbine/DSC_0114.jpg
    I am American

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